Biomedical subjects
Publications and source records attributed to Mitsuo Hatoko.
A woman with genital Paget disease had a reconstruction with a rectus abdominis myocutaneous flap after primary liposuction during operation. The patient recovered satisfactorily.
We report a rare case of chronic expanding hematoma in the right temporal region that developed into a large mass during 12 years. The patient, who had a history of blunt trauma in her right temporal region at the age of 4 months, noticed a slowly growing mass at the same site in the last few months. Computed tomography revealed a well-circumscribed subcutaneous tumor. The tumor was completely resected. Histopathologically, this tumor was confirmed in the diagnosis of chronic expanding hematoma.
We have used a hard palate mucosal graft for reconstruction of the posterior lamella of the eyelid and in only one case was replacement required because of discomfort and pain. The stratum corneum of the hard palate mucosa may have been the cause.
A rare case of chronic expanding hematoma in the right temporal region that developed into a large mass over the course of 12 years is reported. The patient, who had a history of blunt trauma to her right temporal region at the age of 4 months, noticed a slowly growing mass at the same site over the last few months. Computed tomography revealed a well-circumscribed subcutaneous tumor. The tumor was completely resected. Histopathologically, the diagnosis of chronic expanding hematoma was confirmed.
The authors report the use of calcium phosphate cement paste as a material for correction of depression after nasal bone fracture, and evaluate its usefulness. Biopex R (Mitsubishi Material Corporation, Tokyo, Japan) was used in this study as calcium phosphate cement (CPC), which was developed in Japan. CPC injection was used in six patients (four women and two men) with depressed nose deformity after nasal bone fracture. The patients' ages ranged from 29 to 67 years (mean, 49 years), and the follow-up period ranged from 12 to 27 months. The amount of injected cement varied from 0.5 to 2.5 mL, approximately. There was no postoperative infection or allergic reaction in any patient. Clinical and X-ray photography findings showed that a reduction in volume of the injected cement occurred gradually as long as 7 to 8 months after surgery. After that period, the volume was mostly maintained. It seemed that the degree of reduction was approximately 10% to 15% of the original volume. Satisfactory results were obtained in all cases. The authors conclude that the use of CPC is an option for the correction of depressed nose deformity and that its application must be determined in each case, considering its advantages and disadvantages.
Malignant lymphoma of the parotid gland is a rare condition. The authors present the case of a 59-year-old woman with primary malignant lymphoma arising from the parotid gland, in which they resected the tumors and surrounding lymph nodes. Histopathologic examination of the tumor demonstrated a lymphoma of mucosa-associated lymphoid tissue (MALT). Chemotherapy and radiotherapy were performed after surgery. The clinical manifestation, treatment, and postoperative course are described.
BACKGROUND: There have been some reports on the relationship between p53 and keloid formation. However, there have been no studies comparing the p53 expression among scars in various stages of maturity. However, p63 and p73 have been identified as p53-related genes and have been found to be similar to p53 in their structures and functions and these proteins have also been suggested to relate to scar formation. OBJECTIVE: We investigate the expression of three proteins of the p53 family in scars with various clinical manifestations and discuss the shared features and differences of these proteins. METHODS: Forty untreated scar lesions consisting of keloids, hypertrophic scars, and atrophic scars were prepared for investigation. We detected the expression of p53, p63 and p73 proteins using Western blot analysis and histopathological study in each sample. RESULTS: The 40 lesions were divided into four groups according to their clinical manifestations: keloid (Group A), red hypertrophic scar (Group B), white and hard hypertrophic scar (Group C), atrophic white scar (Group D). In Groups A and B, the histopathological findings demonstrated increased fibroblasts, capillary vessels and infiltration of inflammatory cells. In Group C, most of these changes decreased but proliferation of collagen fibers was evident. In Group D, the degree of proliferation of collagen fibers was much less and capillary vessels and infiltration of inflammatory cells were not evident. The levels of p53 protein elevated in Groups A, B and C and were higher in order of Groups A, B and C. In Group D, the level of p53 was almost the same as that of the control. The level of p63 protein was almost the same as that of the control in all groups. The level of p73 protein was elevated only in Group C. CONCLUSION: The p53 family members behave in a different manner in various scar tissues. It is suggested that these proteins play different roles in scar formation and the development of unfavorable scars.
The authors investigated the expression of N-cadherin and alphaN-catenin (which is strongly related to N-cadherin function) in the denervation/reinnervation process using a rat sciatic nerve and gastrocnemius model. In a rat model, the right sciatic nerve was exposed at the mid-thigh region, and the nerve was transected with small scissors. Then, the nerve was sutured using 10-0 monofilament perineurial nylon sutures. At various periods up to 24 weeks after the operation, the gastrocnemius muscle of the treated hindlimbs was removed. Four rats were used at each time point in both groups. N-cadherin and alphaN-catenin expressions were detected by Western blot analysis and immunofluorescent staining with anti N-cadherin and alphaN-catenin antibodies. The level of N-cadherin was already elevated in the first postoperative week, and the level in the second postoperative week was almost the same as in the first. The level decreased gradually after the fourth postoperative week and, in the ninth postoperative week, returned to almost the same as the control level. The level of alphaN-catenin was almost the same as the control (1.0) within the second postoperative week. After the fourth postoperative week, the level elevated gradually, with a peak in the sixth postoperative week. The level then decreased and returned almost to that of the control after the twelfth postoperative week. Immunofluorescent staining was observed along the muscular membrane in all specimens of both proteins, and the time course of the degree of immunofluorescent staining was similar to the results of Western blot analysis. These results suggest that N-cadherin and alphaN-catenin expressions are elevated in the degeneration/regeneration processes of the muscle after nerve injury, but that the kinetics between the two proteins differ.
We present a case of adult umbilical hernia with vertical dislocation along the abdominal wall. The hernial sac arose from the internal ring and connected to the umbilicus 20 mm below the internal ring. The postoperative course was uneventful. Two years and four months after the operation there was no evidence of recurrent hernia even when abdominal pressure was increased, and the umbilicus looked acceptable. An umbilical hernia is usually within the umbilicus. The hernial sac arose from the internal ring so should be called an umbilical hernia not an epigastric hernia. It is unusual that the umbilical hernia dislocates vertically along the abdominal wall, while the umbilicus stays depressed. This atypical form of umbilical hernia has not been described previously as far as we know.
We investigated the expression of N-cadherin by skeletal muscle during the degeneration and degeneration/regeneration processes using the rat sciatic nerve and gastrocnemius muscle model. The right sciatic nerve was exposed in the mid-thigh region, and the nerve was transsected with small scissors. After then, nerve was sutured (sutured group), or both edges of the resected nerve were turned and sutured to the muscle of each side (unsutured group). At various periods up to 24 weeks after the operation the middle portion of the gastrocnemius muscle of the treated hindlimbs was removed. Expression of N-cadherin was detected by western blot analysis and immunofluorescent staining with an anti N-cadherin antibody. In the both groups, the degree of expression had already increased by the end of the first postoperative week, but there were no significant differences between the first and second postoperative weeks between the two groups. However, the values recorded at the fourth, sixth, ninth, and twelfth postoperative weeks were significantly higher in the unsutured group than in the sutured group. Immunofluorescent staining was present around the muscular membrane in all specimens including the control. These results indicated that there was a difference in the kinetics of expression of N-cadherin in skeletal muscle between the degeneration and degeneration/regeneration processes of the muscle after injury to the nerve. It was also clear that N-cadherin has a role at the surface of the muscle cell in skeletal muscle, not in the satellite and inflammatory cells, in both groups.
With the extension of the average life span and the development of surgical technique, anesthesia, and pre- and postoperative management, operations for elderly patients have become more widely accepted. In the field of plastic surgery, free-flap transfers using microvascular techniques have become a common surgical procedure in reconstruction of the head and neck region after surgical removal of a cancer. There have been several reports of free-flap transfer in patients older than 90 years, but the authors know of no reports of free osteocutaneous flap transfer for mandibular reconstruction, which is a very invasive free-flap surgery, for such patients. The mandible plays a significant role in various kinds of dynamic functions, such as mastication, deglutition, and articulation. Disorder of these functions causes a deterioration in the patient's quality of life. The authors have performed a mandibular reconstruction using an osteocutaneous scapular free flap after resection of a gingival cancer invading the mandibular bone in a 93-year-old Japanese woman. In our case, an osteocutaneous scapular free flap, which permits the patient rapid rehabilitation of the lower leg, is thought to be a good choice because it allows the patient to get out of bed as quickly as possible in the postoperative period to minimize additional complications.
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It is well-known that the development of a malignant tumor in a chronic burn scar is one of the long-term complications of a severe burn. Most of these tumors are squamous cell carcinomas, and sarcomas are much rarely seen in chronic burn scars. In the previous literature, 24 cases of burn scar sarcomas were reported. The authors report the second case of dermatofibrosarcoma protuberans arising in a chronic, severe burn scar. A 68-year-old woman with a reddish tumor in the right axilla was referred to the authors' hospital. The patient had sustained severe burns in the right axilla, upper arm, and trunk at the age of 6 years. A biopsy specimen revealed dermatofibrosarcoma protuberans. There was no evidence of distant metastasis. The tumor was excised widely to include the surrounding burn scar. Two years after the operation, there was no evidence of tumor recurrence. As surgeons, we should recognize the possibility of the occurrence of various malignant tumors including sarcomas on burn scars.
To resolve esthetic and psychologic discomfort of patient due to the lack of radius after harvesting radial forearm osteocutaneous flap, we filled the bone defect and recreated its contour using calcium phosphate cement (CPC; Biopex; Mitsubishi Material Corporation, Tokyo, Japan). Injection of CPC was performed in 5 patients (3 women and 2 men). The patients' age ranged from 61 to 72 years (mean, 65 years), and the follow-up period ranged from 8 to 18 months. The size of the radius harvested varied from 10 x 35 mm to 10 x 50 mm. The width of the harvested bone was approximately 25% to 35% of the circumference of radius. Injected CPC volume varied from 3 to 4 mL, approximately. There was no postoperative infection or allergic reaction in any patient, and movement of hand was also with no problem. The X-P findings showed that the bone defect was filled with a uniform, high-density mass. The injected cement reduced in volume gradually during the fourth or fifth postoperative months, but the degree of reduction was mild in any case, which is probably less than 5% of the injected amount, allowing successful recreation of the contour of the radius. We conclude that the use of CPC for filling the defect of the bone donor site after harvesting radial osteocutaneous flap is valid method to keep a patient free from esthetic and psychologic discomfort due to the lack of the radius.
This report present an evaluation 13 consecutive cases of severe burn scar contracture of the axilla and investigates the factors that influence functional improvement. The operation was performed at various times during the period from 3 months to 63 years after the initial burn wound healed. The active range of shoulder abduction before the operation in these patients was restricted to 30-90 degrees. The scar contractures in the axilla were released in all cases and the defects of the axillary region were covered with musculocutaneous flaps or fasciocutaneous flaps. Following operation rehabilitation was performed with the range of shoulder abduction had reached a plateau. The relations between the improved range of shoulder abduction, time to reach a stable range of abduction, patient age and duration of illness in each patient are discussed. Patient with long post-injury periods required a longer time to reach a stable range of abduction. Furthermore, the patients with an extremely long period before operation had difficulties such as nerve injury or stiff joint which restricted improvement. In conclusion, adequate surgical treatment in early period after occurrence of contracture is desirable for burn scar contracture of the axilla.
The authors investigated the expression of three kinds of catenins (alpha, beta, gamma) in vascularized and non-vascularized nerve grafts, using the rat sciatic nerve model. The vascularized nerve, 15 mm in length, was elevated with its nutrient vessels in the left hindlimb of rats. In the right hindlimb, a 15-mm segment of the sciatic nerve was elevated (resected) without the nutrient vessels as a non-vascularized nerve. Both nerves were sutured to the original site. At various periods up to 14 weeks after operation, the entire graft was removed. Expression of three catenins was detected by Western blot analysis and histochemical staining, using the antibody to each catenin. The level of beta catenin increased during nerve regeneration in both the vascularized and non-vascularized grafts, while the level of alpha and gamma catenins did not increase in both grafts. There was no difference in the level of the three catenins between the two methods of nerve grafting. Histochemical findings showed that at the 4th and 14th postoperative weeks, alpha and gamma catenins were stained diffusely in both grafts, while beta catenin was stained around the regenerating axons in both grafts. The degree of beta catenin was greater in the 4th postoperative week than in the 14th postoperative week, but no obvious difference in the degree of staining of the three catenins between two grafts was found. These results suggest that beta catenin may play a different role from alpha and gamma catenins in nerve regeneration, and that the expression of these catenins is not influenced by vascularization of the nerve graft.
Distortion and movement of tissue expanders can cause expansion of the wrong area, such as the naevus or the scar that is to be resected. In 71 rectangular expanders, we examined the incidence of distortion (over 15 degrees) and movement (over 3 cm). We divided the expanders into three anatomical site groups: scalp, body, and extremities, and compared the complication rate between two study groups (distortion or movement, or not). In total, the incidence of distortion was 15/71 (21%) and that of movement 5/71 (7%). Distortion occurred mainly in the extremities (11/33,33%). The implanted expanders tended to move more often in the body part (3/15, 20%). In the extremities, the bigger the angle between the axis of the implanted expander and that of the extremity, the bigger the angle of distortion. Although the incidence of complications between the two groups was not significant, except for alteration in design of the flap, we recommend that these points should be considered when preoperative plans are being made for appropriate patients.
The authors report the influence of periosteum on healing of palatal defect based on more than 10 years of experience of harvesting hard palate mucosa. Between June of 1991 and May of 2001, the authors harvested 80 hard palate mucosae as graft material for skin and mucosa defects. All grafts were harvested from the center of the hard palate. Patients ranged in age from 10 to 82 years old. Of 80 mucosae, 54 were harvested with periosteum, and periosteum was not retained in the defect bed. The other 26 mucosae were harvested without periosteum, which was therefore retained in the defect bed. The healing time increased depending on the defect size in both groups of patients retaining and not retaining periosteum. There was a significant relationship between the defect size and healing time in both groups (Spearman's rank correlation test, p < 0.0001 in both groups). In the two groups, there was no significant relationship between patient age and healing time in the patients with defect smaller than 1.99 cm or larger than 2.00 cm2. There were no significant differences in the rate of patients with pain and bleeding between the groups retaining and not retaining periosteum. In the group not retaining the periosteum, all 54 patients showed a flat or atrophic smooth surface at more than 6 months after epithelization and had no discomfort. However, 17 patients showed flat or atrophic smooth surface in the group retaining the periosteum and the remaining 9 patients showed hypertrophy at more than 6 months after epithelization, with accompanying discomfort. The rate of the patients with hypertrophy in the group of patients retaining periosteum was significantly high as compared with that in the group of patients not retaining periosteum (p = 0.000013, Fisher's exact test). In 26 patients retaining periosteum, the age of the patients with hypertrophic surface was significantly younger than that of the patients with flat or atrophic surface (p = 0.0010, Welch's -test), and the defect size in the patient with hypertrophic surface was significantly smaller than that of the patients with flat or atrophic surface (p = 0.0028, Welch's t-test). In conclusion, our study demonstrated that the existence of periosteum in the palate donor bed does not contribute to reduced healing time or reduced pain. Rather, retaining the periosteum caused hypertrophy of the donor site, leading to discomfort, especially in young patients with a comparatively small defect.