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At least 793 records · Page 44Linked to original sources

PubMed1996

Prefabrication of combined scapula flaps for microsurgical reconstruction in oro-maxillofacial defects: a new method.

Nowadays, in congenital or acquired large oro-maxillofacial defects, microsurgical reconstruction is mainly performed by revascularized osseous, osteocutaneous, or osteomyocutaneous distant flaps. The aims of reconstruction include not only restoration of stability and aesthetic contour, but also the restoration of a functioning 'chewing organ'. In addition to bulkiness of the flaps, the stepwise surgical procedure (microvascular reconstruction, osseointegration of implants, secondary correction of flaps including preprosthetic surgery, etc.) prevents physiological oral function for a long time, and has some implications for creating an alternative method of microsurgical reconstruction with newly designed flaps. For reconstruction in maxillary and midface defects we prefer the use of the scapula flap. Since modern diagnostic methods allow comprehensive planning and defining of all relevant anatomical and functional factors in advance, the 'simultaneous' microvascular reconstruction by prefabricated scapula flaps has become possible and offers some advantages. The tissue prefabrication results in osseointegrated implants and thin mucosal linings with stable peri-implant soft tissue conditions at the time of microsurgical reconstruction. Postoperatively, after immediate dental restoration full oral function is attained. The 'simultaneous' reconstruction improves the psychosocial situation of the patient considerably.

Adult↗

PubMed2005

[Anatomic study and advantages of the free rectus abdominis flap for head and neck reconstruction].

INTRODUCTION: The main goal of using the free flap is to be able to carry out extensive surgical resection resulting in good functional outcome. The aims of this study were to define the best area for free rectus abdominis harvest and to assess its value in head and neck reconstruction. MATERIAL AND METHODS: Twenty rectus abdominis flaps were studied in ten fresh cadavers. A review of the literature of the free rectus abdominis flap in head and neck reconstruction yielded the main recipient sites and complications (flap necrosis and postoperative abdominal hernia). A reconstruction was performed after near total glossectomy. RESULTS: With seven perforators and four cutaneous branches of intercostal nerves, the paraumbilical region is the best area to harvest this flap. The rectus abdominis free flap seems to be adapted for near total glossectomy reconstruction. Previous studies reported that this flap was essentially used for oropharynx and skull base reconstruction. The main complications are flap necrosis (4%) and abdominal hernia (3%). CONCLUSION: The paraumbilical rectus abdominis free flap is reliable and easy to use with a two-team approach in head and neck reconstruction with moderate donor site morbidity. It is useful for reconstruction of large defects of the oropharynx and skull base. Sensory-motor reinnervation superiority for deglutition in tongue reconstruction still needs to be evaluated.

Cadaver↗

PubMed2007

A computational study of the reconstruction of amorphous mesoporous materials from gas adsorption isotherms and structure factors via evolutionary optimization.

A general method for the three-dimensional reconstruction of mesoporous materials by evolutionary optimization against target data is developed. The method is applied specifically in reconstruction of amorphous material models using gas adsorption data, structure factor data, or a combination of both. A recently introduced lattice-gas approach is used to model adsorption in these calculations, and a high-pass limited Fourier representation is used to facilitate evolution of large-scale structures during the optimization. Reconstructions are made of several material models which mimic real materials obtained either by phase separation and etching or by sol-gel processing. Analysis of the reconstructions provides considerable insight into the type and quantity of structural information probed by gas adsorption and small-angle scattering experiments. We find that reconstructions based only on structure factors tend to underestimate the mean pore size. We also find that in many cases excellent reconstructions can be obtained using only adsorption-branch data, and that in all cases reconstructions based jointly on both types of data are superior to those based only on one, suggesting that these measures contain "complementary" information. It is also found that in most cases the use of desorption data is not warranted, and that the use of adsorption data taken at many temperatures will not improve reconstructions. The reproducibility of the method is shown to be satisfactory. The method can be computationally expensive if gas adsorption data are used, but it is easily parallelized, and therefore results can still be obtained in reasonable time. Finally, the possible application of this approach to real systems, including templated porous materials, is discussed.

Journal Article↗

PubMed1998

Oculoplastic reconstruction following Mohs surgery.

PURPOSE: Mohs micrographic surgery has been advocated as the optimal management of nonmelanoma skin cancer in the periocular region. It is a technique that is ideally suited to the removal of skin tumours with a contiguous growth pattern such as basal cell carcinoma and squamous cell carcinoma, allowing examination of 100% of the surgical margin. As a result of this total margin control, the technique offers an unsurpassed curve rate combined with maximal preservation of normal tissue. Following excision of a periocular tumour by a Mohs surgeon, the resulting defect usually requires reconstruction. Our objective was to determine whether the size of defect produced by Mohs surgery and the type of reconstruction required differed from the results we would have expected from standard surgery with a 3 mm excision margin. METHODS: A Mohs surgery service with a combined dermatological and oculoplastic approach was set up in Manchester in 1994. We reviewed 60 of our patients who underwent Mohs surgery and compared the size of defect produced as well as the type of reconstruction required with the results we would have predicted for standard excisional surgery with a 3 mm margin. RESULTS: Although a minority of patients required larger reconstructions than would have been anticipated (20%), many had smaller reconstructions than we had predicted (37%). This latter group often had important structures preserved, and therefore had the benefit of less extensive reconstructive surgery. CONCLUSIONS: Excision of a periocular tumour by Mohs surgery may occasionally identify extensive subclinical tumour extension and so produce an unexpectedly large defect for reconstruction. Many patients, however, require less extensive reconstructive surgery than would have been predicted. This produces benefits in terms not only of improved cosmesis and eyelid function, but also reduced operating theatre costs.

Adult↗

PubMed2001

Rib graft reconstruction versus osseointegrated prosthesis for microtia: a significant change in patient preference.

Until recently the options for reconstruction of the microtic ear were unsatisfactory and the ear was often left alone. With recent advances, both autologous rib reconstruction and osseointegration produce good quality results. It is our practice to offer all patients a choice of no surgery, autologous rib cartilage reconstruction or an osseointegrated prosthetic ear. This study reports on parental choice between the reconstructive options as assessed by questionnaire. Earlier patients who have had their surgery were compared with more recent patients who have chosen an option but are awaiting surgery. In the patients who have had surgery, seven (30%) chose a prosthetic ear and 16 (69.5%) chose rib cartilage reconstruction, compared to those patients that are awaiting surgery, four (11%) chose a prosthetic ear and 31 (88.6%) chose rib cartilage reconstruction. The results show a significant increase in the choice for rib cartilage reconstruction in those patients awaiting surgery. Although high quality autologous reconstruction is not widely available we feel it is important that parents are at least informed that it is an alternative to osseointegration and no surgery.

Child↗

PubMed1999

Immediate breast reconstruction after mastectomy for cancer.

AIMS: The oncological, surgical and cosmetic results, patient satisfaction and psychological morbidity of immediate breast reconstruction following mastectomy for breast cancer were evaluated. METHODS: From 1980 to 1994, 79 immediate breast reconstructions were performed in Malmö. From 1985 immediate breast reconstruction was performed in 21% of mastectomies among patients </=65 years. The most common indication for immediate reconstruction was extensive DCIS+/-multifocal invasive growth. In 61 cases permanent implants were used and in 18 expanders. The median volume in the permanent implants was 225 ml, compared with 380 ml in cases where expanders were used. RESULTS: Post-operative complications requiring re-operation occurred in 13%. After introduction of the expander technique, no necrosis requiring explanation has occurred. Of the patients receiving radiotherapy, 71% developed capsular contracture (10/14). Four patients developed locoregional recurrence. Three-quarters of the patients had an acceptable to very satisfactory cosmetic result. Eight per cent were judged to have a Baker III-IV contracture. Of the patients, 85% were satisfied with the softness of the reconstructed breast and 76% stated the result to be in accordance with their expectations. CONCLUSIONS: We find immediate breast reconstruction after mastectomy a safe operation with results comparable to those after late reconstruction and without an increased risk of recurrence. Immediate reconstruction with an implant is not recommended in cases where radiotherapy may be necessary.

Adult↗

PubMedDate not supplied

Extra-articular lateral reconstruction technique.

This article describes an anterolateral reconstruction procedure that, when used in combination with an intra-articular anterior cruciate ligament (ACL) reconstruction, restores rotary and anterior knee stability. We believe that failing to recognize lateral instabilities and to perform an extra-articular reconstruction is an under-recognized cause of failure of ACL reconstruction. We also describe the indications, medical histories, and physical examination tests used to determine when an anterolateral reconstruction is needed. One should suspect a compromise of the lateral structures when presented with a failed ACL reconstruction in which the tunnels, the graft, and the rehabilitation all seem to have been done properly, or when a prior lateral procedure has been attempted and failed. In our experience, if a second ACL reconstruction is undertaken without the benefit of a lateral reconstruction, it may fail as well.

Anterior Cruciate Ligament↗

PubMed2002

Serial magnetic resonance imaging evaluation of the patellar tendon after posterior cruciate ligament reconstruction.

PURPOSE: Our purpose was to prospectively analyze serial changes in magnetic resonance imaging (MRI) signal of the bone-patellar tendon-bone autograft when used for posterior cruciate ligament (PCL) reconstruction and to retrospectively determine at mid-term follow-up the relationship between MRI graft appearance and clinical stability in patients who have undergone arthroscopic PCL reconstruction with a bone-patellar tendon-bone autograft. TYPE OF STUDY: One prospective serial blinded study and 1 retrospective blinded study. METHODS: The first part of the study focused on MRI scans obtained at 3, 6, 9, and 12 months postoperatively in a case series of 10 consecutive patients who underwent arthroscopically assisted PCL reconstruction (group A), and of 10 patients who underwent combined ACL-PCL arthroscopic reconstruction (group B). For the second part of the study, MRI scans were obtained in a retrospective series of 10 patients at mid-term follow-up after PCL arthroscopic reconstruction (group C). Signal intensity of 3 zones, corresponding to the proximal, middle, and distal intra-articular graft zones, was evaluated according to the Howell et al. classification. Fiber continuity assessment was performed using a modified Kühne et al. score. The signal intensity of the 3 zones was independently scored. Knee stability was clinically and instrumentally graded according to the IKDC evaluation form (group 4). A multivariance analysis and grouped t test were used for statistical evaluation. RESULTS: In group A, the average MRI evaluation score was 7.65 +/- 1.6 at 3 months, 3.8 +/- 0.6 at 6 months, 4.75 +/- 1 at 9 months and 6.25 +/- 1.2 at 1 year. The portion of graft exiting the femoral tunnel exhibited increased signal and faster maturation than the tibial tunnel. In group B (combined ACL-PCL reconstruction), the graft showed slower graft healing with an average MRI score of 4.85 +/- 0.7 at 3 months, 1.9 +/- 0.7 at 6 months, 3.9 +/- 0.9 at 9 months, and 5.3 +/- 1.1 at 1 year. At 1 year follow-up, there was no correlation between MRI appearance and stability in group A, even with MRI findings of fiber continuity. However, at long-term evaluation (group C), a strict correlation between MRI appearance and achieved stability was found. CONCLUSIONS: The patellar tendon when used for PCL reconstruction requires more than 1 year to achieve a low-signal intensity over its entire course, and the distal zone near the tibial tunnel shows a slower healing process. MRI graft assessment is useful only 1 year or more following PCL reconstruction.

Adolescent↗

PubMed2003

The role of complex hepatic artery reconstruction in orthotopic liver transplantation.

The goal of this study was to analyze the influence of multiple anastomosis on outcome in orthotopic liver transplantation (OLT) and its implications for split-liver and living related liver transplantation programs. In a retrospective study, 683 first OLTs in adults were analyzed. Complex hepatic artery reconstruction was defined as revascularization of the graft requiring additional anastomosis between donor hepatic arteries. OLT was performed in a standard manner. All patients had daily ultrasound examination. In this series we found 72 grafts (10.5%) with anatomic arterial variations that required complex hepatic artery reconstruction. There was no difference in primary organ function and demographic data compared with patients with simple arterial reconstruction. However, hepatic artery thrombosis (HAT) occurred in 9.7% of patients (7 of 72) with complex reconstruction in contrast to 2.0% in the control group (12 of 638; P <.001). Statistical analysis identified multiple anastomoses (P <.002) and primary nonfunction (P <.02) as significant risk factors for HAT. Three patients underwent successful thrombectomy for HAT, all others had to undergo retransplantation. Although in the group with complex arterial reconstruction increased graft loss caused by HAT was found early postoperatively, the overall 5-year patient and graft survival was not different for both groups. Although complex reconstruction is a risk factor for HAT, early diagnosis of HAT by daily ultrasound and early repeat OLT can provide similar 5-year survival as for patients with simple reconstruction. We conclude that complex hepatic artery reconstruction challenges conventional OLT as well as split-liver and living related liver transplantation, but does not necessarily affect its long-term outcome.

Adolescent↗

PubMed2002

A case report: reconstruction of a damaged knee following treatment of giant cell tumor of the proximal tibia with cryosurgery and cementation.

OBJECTIVE: Reconstruction of a knee damaged by cement packed to cure a giant-cell tumor is sometimes difficult. We reconstructed such a knee by removal of the cement, autologous bone transplantation and distraction osteogenesis using the Ilizarov apparatus. In this paper the results 29 months after the salvage surgery are given. PATIENT AND METHODS: We saw a 31-year-old woman's knee joint that showed osteoarthritic change after curettage, cryosurgery and cementation performed 4 years previously for a giant-cell tumor of the proximal tibia. We reconstructed the knee joint. This procedure included cement removal, alignment correction by tibial osteotomy, subchondral bone reconstruction by autologous bone transplantation, and filling the defect after removing the bone cement by elongating the diaphysis using the Ilizarov apparatus. RESULTS: Distraction was terminated 4 months later when 54 mm of elongation was performed. All devices were removed 12 months after the surgery. Seventeen months after the removal of the apparatus, the range of motion of the right knee was 0 degrees extension and 110 degrees flexion, and the patient was able to walk without pain. CONCLUSIONS: Although the treatment period is long and there may be some complications of Ilizarov lengthening and distraction osteogenesis, this procedure has numerous benefits. Bony defects can be soundly reconstructed and, at the same time, the alignment of the knee can be corrected. Also it is not necessary to reconstruct the ligaments because the insertions are intact. If osteoarthritis progresses, a surface type total knee replacement can be performed, not constrained type prosthesis, which would be used if the bony structure had not been reconstructed. This procedure may be one of the candidates for reconstructing such knee joints destroyed by bone cement.

Adult↗

PubMed1999

[Pedicled versus free TRAM flap for breast reconstruction].

In breast reconstruction, the free TRAM-flap offers many advantages over the pedicled TRAM-flap. Due to its superior perfusion, the free flap rarely develops necrosis. Shaping of the flap is easier due to the lack of the thick muscle pedicle. Because the rectus muscle is spared, there is minimal donor site morbidity. However, the necessary microvascular anastomoses reduced the acceptance of the free TRAM-flap. During a 13-months period, 51 breast reconstructions were performed in 41 patients, 31 unilateral and ten bilateral. 45 flaps served for delayed reconstruction and six flaps for immediate reconstruction. The operations were performed by two teams working simultaneously. The average operating time was 3.9 hours for unilateral and 6.9 hours for bilateral delayed reconstruction. For immediate reconstruction, 6.2 and 6.3 hours were required for uni- and bilateral procedures, respectively. In 38 flaps, the thoracodorsal vessels served as recipient vessels; 13 flaps were anastomosed to the internal mammary artery and vein. Postoperative complications were observed in 13 patients. Three vessel anastomoses had to be revised. In one flap, a partial necrosis occurred; in two flaps hematoma evacuation was necessary. Two patients suffered from fat necroses at the abdomen and one umbilicus was lost. Skin irritations and seromas at the abdomen occurred in five patients. Pulmonary embolism was diagnosed in one patient three weeks postoperatively. Abdominal hernias or bulging in the epigastric area were not observed up to 15 months after reconstruction. These results reveal a low complication rate for breast reconstruction with the free TRAM-flap. The advantages of this technique as compared to the pedicled technique are discussed.

Adult↗

PubMed2000

[CT angiography hemodynamically relevant to renal artery stenosis. Evaluation of AXIAL, MPR, MIP and SSD reconstruction procedures under standard investigation conditions].

PURPOSE: To evaluate the various reconstruction methods of helical-CT angiography for the assessment of hemodynamically relevant renal artery stenoses in comparison to i.a. DSA. METHODS: In 76 renal arteries the reconstruction modalities AXIAL, MRP, MIP and SSD of helical-CT angiography were compared with the results of i.a. DSA for the determination of the grade and location of the stenosis. RESULTS: The highest accuracy of stenosis grading was 76% with AXIAL reconstruction. In 8% of the cases grading of the stenosis was not evaluable by the AXIAL reconstruction. In these cases, a higher sensitivity in the detection of hemodynamically relevant stenoses (> grade II, > 50%) was achieved with the reconstruction mode MPR (96%) than with MIP (92%). In 51% of the cases the reconstruction mode SSD was not suitable for any diagnosis of renal artery stenosis because of overlying calcified plaques. CONCLUSIONS: The evidence of hemodynamically relevant stenosis in helical-CT angiography in comparison to i.a. DSA succeeds most reliable by using the reconstruction modality AXIAL in combination with MPR. The MIP reconstruction provides information about the anatomy of the renal arteries within one image.

Angiography↗

PubMed2001

[Value of selective MIP reconstructions in respiratory triggered 3D TSE MR-cholangiography on a workstation in comparison with MIP standard projections and single-shot MRCP].

PURPOSE: Comparison of anatomical visualisation and diagnostic value of selective MIP reconstructions of respiratory triggered 3D-TSE-MRCP versus standard MIP reconstructions and single-shot MRCP. MATERIAL AND METHODS: 50 patients with pancreaticobiliary disease were examined at 1.5 Tesla (ACS NT II, Philips Medical Systems) using a breath-hold single-shot (SS) and a respiratory triggered 3D-TSE-MRCP technique in 12 standard MIP projections. Additional selective MIP reconstructions with different slice thickness (2, 4, 10 cm) and projections were performed on a workstation. Visualization of the pancreaticobiliary system and the diagnostic value of the examinations were analysed. RESULTS: Single-shot and 3D-TSE in standard projections showed comparable anatomical visualisation. On selective MIP reconstructions the biliary system (SS p < 0.002; 3D-TSE p < 0.000) and the periampullary region (SS p < 0.000; 3D-TSE p < 0.003) were more clearly seen than on SS and standard MIP reconstructions. Furthermore, superior visualisation of the pancreatic duct could be achieved with additional selective MIP reconstructions in contrast to standard MIP (p < 0.003). Sensitivity and diagnostic accuracy showed superior results for selective and standard MIP reconstructions, but no significant differences between the three techniques were found. CONCLUSION: SS and standard MIP reconstructions showed comparable anatomical visualisation. Selective MIP postprocessing on a workstation offers a better visualisation of the pancreaticobiliary system and is useful for detecting pathological alterations.

Artifacts↗

PubMed2001

[The route of reconstruction following esophagectomy].

The route of reconstruction following esophagectomy.Retrosternal reconstruction shows an increased rate of postoperative non-surgical complications and a slightly increased mortality compared to posterior mediastinal reconstruction. Radionuclid transit through the gastric tube is significantly longer in either way of reconstruction compared to normal controls. Tracerretention is significantly increased after retrosternal reconstruction. This however has no impact on the patients' quality of life. We therefore recommend posterior mediastinal reconstruction provided that curative resection is definitely achieved in order to avoid possible complications by local recurrence. In the palliative situation we would rather choose the retrosternal route of reconstruction as the functional disadvantages had no negative effect on quality of life and the general disadvantages seem to be neglectable in this situation. The same is true if adjuvant radiation of the tumorbed is planned. Pyloroplasty in our opinion is unnecessary. The presternal route of reconstruction is underrepresented in the literature. In our experience it has no indication.

Adenocarcinoma↗

PubMed2001

[Reconstruction modes following gastrectomy. Results of experimental and clinical controlled trials].

Reconstruction modes following gastrectomy. Results of experimental and clinical controlled trials. In animal experiments four reconstruction methods following gastrectomy were compared: Roux-en Y reconstruction with (n = 33) and without pouch (n = 50) and isoperistaltic jejunum interposition with (n = 26) and without pouch (n = 55). The results were mostly influenced by the extent of esophagitis, documenting the reflux reduction by a pouch. Weight gain was slightly higher following jejunum interposition.Roux-en Y pouch reconstruction with jejunum interposition with pouch was compared in a randomized controlled trial. The additional operative effort of jejunum interposition did not achieve benefits in outcome. Therefore, Roux-en Y reconstruction should be advocated as standard reconstruction. The second randomized controlled trial compared Roux-en Y reconstruction with and without pouch. After more than three years, there was an advantage in life quality for patients with pouch indicating that patients with a favorable prognosis following gastrectomy should be reconstructed with a pouch.

Anastomosis, Roux-en-Y↗

PubMed2003

Anterolateral thigh flap for breast reconstruction: review of the literature and case reports.

More women than ever before are undergoing mastectomies secondary to increased awareness and screening. This has also caused a corresponding increase in the number of breast reconstructions requested each year. The demand for improved results has fueled recent advances in new techniques. Aside from implant reconstruction, the methods now being employed are related to autogenous donations and reconstruction. Currently, the most commonly used techniques for autogenous breast reconstruction are the DIEP (deep inferior epigastric perforator) and TRAM (transverse rectus abdominis myocutaneous) flaps from the lower abdomen. The anterolateral thigh flap is a type of perforator flap usually described for use in head and neck reconstruction. The authors have discovered this flap's utility as an alternative in autogenous breast reconstruction when the abdomen is not available as a donor site. A review of the literature reveals a dearth of experience in using the anterolateral thigh flap for breast reconstruction. The article reviews the literature with regard to current uses of the anterolateral thigh flap, and then reports three case studies which highlight the thigh flap as an excellent alternative for breast reconstruction in selected patients.

Adult↗

PubMed2005

Coronal ultra-thick multiplanar CT reconstructions (MPR) of the pelvis in the multiple trauma patient: an alternative for the initial conventional radiograph.

PURPOSE: Multiple trauma patients with clinically suspected pelvic fractures often directly undergo a CT scan. However, the initial portable pelvis film (PPF) for further follow-up is then not available. This study examines whether coronal ultra-thick multiplanar reconstructions from CT data are similar when compared with the initial PPF, thus having the potential to serve as an alternative baseline image. MATERIALS AND METHODS: Initial PPF and coronal ultra-thick multiplanar CT reconstructions of 33 multiple trauma patients with pelvic fractures were retrospectively analyzed by two independent radiologists with regard to image quality, visualization of anatomical landmarks, and diagnostic accuracy. The primary diagnosis of pelvic fractures was made by using thin axial CT images and thin slice coronal and sagittal reconstructions and served as the standard of reference. RESULTS: Coronal ultra-thick multiplanar CT reconstructions were superior to PPF regarding image adjustment (p < 0.02), absence of overlaying structures (p < 0.05), and overall image quality (p < 0.01). Visualization of most anatomical landmarks was similar with both modalities, except of the iliosacral joint and acetabular lines which were more accurately depicted on ultra-thick multiplanar CT reconstructions (p < 0.05). Diagnostic accuracy of coronal ultra-thick CT reconstructions was similar to PPF regarding most fracture types, except of a higher accuracy of coronal ultra-thick CT reconstructions for iliosacral joint and acetabular column fractures (p < 0.05). CONCLUSION: Coronal ultra-thick multiplanar CT reconstructions of the pelvis provide similar image quality and diagnostic accuracy compared to PPF and are therefore suited as alternative baseline image in multiple trauma patients who directly undergo CT.

Adult↗

PubMed1998

Use of bilateral folded radial forearm free flaps for reconstruction of a midface gunshot wound.

Optimal treatment of midfacial gunshot wounds includes early definitive reconstruction of the bony scaffold to prevent soft tissue contraction. When this is not possible, secondary reconstruction is more difficult. The authors present a case of delayed reconstruction of a midface gunshot wound. Two months following a self-inflicted, submental gunshot wound and eventual rigid fixation of the remaining midfacial bony anatomy, two simultaneous radial forearm free flaps were utilized in the reconstruction. The first flap was folded onto itself to recreate the hard palate in conjunction with a split rib graft; the second flap filled the remaining soft-tissue defect and simultaneously provided lining for an eventual staged nasal reconstruction. The second stage of the nasal reconstruction was completed 5 weeks later with a calvarial bone graft and forehead flap. This dual microsurgical approach allowed for one-step reconstruction of both surfaces of the hard palate, resulting in separate oral and nasal cavities, and optimizing the patient's ability to speak and eat. Extensive soft-tissue contraction encountered in late reconstructions underscores the importance of an early, definitive, surgical approach in these difficult wounds.

Adolescent↗