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T Treumann

Publications and source records attributed to T Treumann.

12 recordsLinked to original sources
PubMed2004

[Cine MRI of the temporomandibular joint in comparison to static MRI and axiography].

PURPOSE: To evaluate Cine MRI (cMRI) of the temporomandibular joint in comparison to static MRI (sMRI) and axiography. MATERIALS AND METHODS: In a prospective study with 57 healthy volunteers as well as 33 patients after temporomandibular joint (TMJ) surgery or with severe joint dysfunction, we measured the mobility of both condyle and disc as well as the sagittal angle of condylar inclination with sMRI and cMRI. Measurements and image analysis were performed by a radiologist and a maxillofacial surgeon in consensus. The results of axiography served as standard of reference. RESULT: Concerning the assessment of the discoligamentous complex, sMRI was superior to cMRI in the patient-group (sensitivity sMRI 85 %, cMRI 76 %), while no significant difference was found in the volunteer-group (sensitivity sMRI 97.4 %, cMRI 98.3 %). The results of cMRI and sMRI showed a highly significant correlation with each other, as well as with the axiographic reference tracings (r = 0.90). The average mobility of the disc and condyle was 6 % and 10 % higher in sMRI compared to cMRI (p = 0.001) and showed a slightly higher variance (0.043 vs. 0.038). Concerning the condylar inclination angle, both MRI-procedures had the best correlation (r = 0.94) with each other and axiography. CONCLUSION: Real-time MRI of the TMJ is comparable to axiography in its accuracy and is a useful adjunct to conventional static MRI.

Adult↗
PubMed2002

[Significance of endorectal nuclear magnetic resonance tomography and transrectal ultrasound diagnosis in local staging of prostatic carcinoma].

METHODS: We assessed the staging accuracy of endorectal magnetic resonance imaging (eMRI) and transrectal ultrasonography (TRUS) for localized prostate cancer. 54 patients with biopsy proven prostate cancer underwent TRUS and eMRI prior to radical retropubic prostatectomy. The MR images were prospectively interpreted by two radiologists. These findings were compared with the histopathological results. RESULTS: Overall accuracy of eMRI in defining local tumor stage was 93% by radiologist A and 56% by radiologist B. Overall accuracy by TRUS was 63%. Analysis of interobserver agreement showed a poor correlation regarding MRI studies. Endorectal MRI was more sensitive than TRUS for detecting capsular penetration and seminal vesicle involvement. TRUS revealed a relatively high specificity and was superior to eMRI in this regard. CONCLUSION: This series shows the current limited value of TRUS and eMRI for planning treatment in patients with clinically localized prostate cancer.

Aged↗
PubMed2001

[Diagnostic imaging in vascular diagnosis].

Previously, vascular imaging was done exclusively using angiography (X-ray projectional imaging of vessels opacified by iodinated contrast media). Recently angiography especially is used in combination with angioplasty (percutaneous enlargement of a closed or stenotic vessel). There has been a change from invasive to non invasive procedures. New developments in computed tomography (CT), magnetic resonance imaging (MR) and ultrasound have reduced the indications for the invasive digital subtraction angiography (DSA). Further improvement especially im MR-angiography and colour-coded dopplersonography will cover all primary diagnostic vascular examinations.

Arterial Occlusive Diseases↗
PubMed2001

Limited value of endorectal magnetic resonance imaging and transrectal ultrasonography in the staging of clinically localized prostate cancer.

OBJECTIVE: To examine the role of endorectal magnetic resonance imaging (eMRI) and transrectal ultrasonography (TRUS) for clinically localized prostate cancer and to assess interobserver agreement in interpreting MRI studies. PATIENTS AND METHODS: Fifty-four patients with biopsy-confirmed prostate cancer underwent TRUS and eMRI before radical retropubic prostatectomy. The MR images were prospectively interpreted by two radiologists with special expertise in this field. The criteria evaluated prospectively in each patient were extracapsular extension (ECE) and seminal vesicle invasion (SVI). The results were correlated with the histopathological findings after radical prostatectomy. RESULTS: At pathology, 27 patients had stage pT2, 15 had stage pT3a and 12 had stage pT3b lesions. The overall accuracy of eMRI in defining local tumour stage was 93% by radiologist A and 56% by radiologist B; the overall accuracy by TRUS was 63%. There was a poor correlation for the MRI studies between observers. The eMRI was more sensitive than TRUS for detecting ECE and SVI in organ-confined prostate cancer. TRUS had a relatively high specificity for ECE and SVI, and was better than eMRI in this regard. CONCLUSION: Whereas MRI tended to over-stage, TRUS under-staged prostate cancer. This series shows the current limited value of TRUS and eMRI for planning treatment in patients with clinically localized prostate cancer. Treatment decisions should not be altered based on TRUS or eMRI findings alone.

Aged↗
PubMed1999

Imaging of lung cancer with fluorine-18 fluorodeoxyglucose: comparison of a dual-head gamma camera in coincidence mode with a full-ring positron emission tomography system.

Dual-head gamma cameras operated in coincidence mode are a new approach for tumour imaging using fluorine-18 fluorodeoxyglucose (FDG). The aim of this study was to assess the diagnostic accuracy of such a camera system in comparison with a full-ring positron emission tomography (PET) system in patients with lung cancer. Twenty-seven patients (1 female, 26 males, age 62+/-9 years) with lung cancer or indeterminate pulmonary nodules were studied on the same day with a full-ring PET scanner (Siemens ECAT EXACT) and a coincidence gamma camera system (ADAC Vertex MCD). Sixty minutes after injection of 185-370 MBq FDG, a scan of the chest was performed with the full-ring system. Approximately 2 h p.i., the coincidence camera study was performed. Coincidence gamma camera (CGC) and PET images with (PETac) and without attenuation correction (PETnac) were analysed independently by two blinded observers. In addition, FDG uptake in primary tumours and involved lymph nodes was quantified relative to normal contralateral lung (T/L ratios). All primary tumours were histologically proven. The lymph node status was histologically determined in 23 patients. In four patients, no lymph node sampling was performed because of extensive disease or concurrent illnesses. In the 27 patients, 25 primary lung cancers and two metastatic lesions were histologically diagnosed. The number of coincidences per centimetre axial field of view was 3.33+/-0. 93x10(5) for the CGC and 1.09+/-0.36x10(6) for the dedicated PET system. All primary tumours (size: 4.6+/-2.6 cm) were correctly identified in the CGC and dedicated PET studies. T/L ratios were 4. 7+/-2.5 for CGC and 6.9+/-2.8 for PETnac (P <0.001). Histopathological evaluation revealed lymph node metastases in 11 of 88 sampled lymph node stations (size: 2.3+/-1.0 cm). All lymph node metastases were identified in the PETac studies, while PETnac detected 10/11 and CGC 8/11. For positive lymph nodes that were visible in CGC and PETnac studies, T/L ratios were 3.7+/-2.3 for CGC and 6.6+/-3.1 for PETnac (P=0.02). The diameters of false-negative lymph nodes in the CGC studies were 0.75, 1.5 and 2 cm. False-positive FDG uptake in lymph nodes was found in two patients with all three imaging methods. For all lesions combined, T/L ratios in CGC relative to PETnac studies decreased significantly with decreasing lesion size (r=0.62; P<0.001). In conclusion, compared with a full-ring PET system the sensitivity of CGC imaging for detection of lung cancer is limited by a lower image contrast which deteriorates with decreasing lesion size. Nevertheless, the ability of CGC imaging to detect pulmonary lesions with a diameter of at least 2 cm appears to be similar to that of a full-ring system. Both systems provide a similar specificity for the evaluation of lymph node involvement.

Aged↗
PubMed1998

Controlled prospective study of positron emission tomography using the glucose analogue [18f]fluorodeoxyglucose in the evaluation of pulmonary nodules.

BACKGROUND: Positron emission tomography (PET) is a new imaging technique which, by measuring focal metabolic activities, can make a qualitative statement (benign or malignant) about a tumour. PET has been described in many studies to provide a high diagnostic accuracy for the evaluation of pulmonary coin lesions. However, these studies were not always supported by histological confirmation of the results. In a controlled prospective study, it was investigated whether the diagnostic accuracy of PET is sufficiently high to allow omission of diagnostic thoracotomy or thoracoscopy in the case of a negative finding. METHODS: A PET scan was carried out before operation using [18F]fluorodeoxyglucose (FDG) in 50 patients with pulmonary coin lesions (diameter 30 mm or less). All of these lesions were completely removed thoracoscopically or by a formal thoracotomy and were examined histologically. Using the histology results, the diagnostic accuracy of the PET procedure with regard to a benign or malignant diagnosis was evaluated and compared with that of computed tomography (CT). Results From a total of 54 coin lesions (four of the 50 patients had two lesions) there were 31 malignant (19 primary bronchial carcinomas, 12 metastases) and 23 benign diagnoses. With the PET procedure 28 of 31 malignant and 19 of 23 benign lesions were classified correctly (sensitivity 90 per cent, specificity 83 per cent). False negatives included two bronchial carcinomas and one metastasis. CT had a sensitivity of 100 per cent and specificity of 52 per cent. CONCLUSION: FDG PET cannot generally be considered as a replacement for diagnostic thoracoscopy or thoracotomy at the present time. However, by combining FDG PET with radiological follow-up, clinical applications may evolve in patients at low risk for a malignant tumour or at high risk for surgical complications.

Adenocarcinoma↗
PubMed1990

[Liver hemangioma. I. Diagnosis, spontaneous course, complications].

Hemangioma is the most frequent benign tumor of the liver. Clinical signs range from complete absence of any complaints to the life threatening complication of hemorrhage. Ultrasound, computed tomography, angiography, scintigraphy and magnetic resonance tomography are appropriate diagnostic tools. The spontaneous course depends on diameter and localization of the tumor; the majority of complications are documented for hemangiomas of more than 5 cm in diameter and superficial position.

Diagnostic Imaging↗
PubMed1990

[Liver hemangioma. II. Surgical indications, choice of procedure, results].

From our point of view surgical therapy for liver hemangioma is indicated for tumors with a diameter exceeding 5 cm, with superficial position, and complaints. Further criteria are changes in size or internal structure of the tumor. Treatment of choice are atypical and anatomical resections, respectively, according to the size of the hemangioma. Elective surgery can be performed with considerable low risks with respect of the spontaneous course.

Adult↗
PubMed1989

[Parasitic liver cyst. Indications and choice of procedure in cystic echinococcosis].

About 60-90% of clinically diagnosed cases of echinococcosis are found in the liver. Half of these patients show episodes of acute abdominal or back pain. The others complain about discrete and unspecific symptoms. Diagnosis is confirmed by combination of imaging techniques and serologic tests. Operation still is the only way for eradication of the parasite. This paper presents a summary of the literature and clinical data of 27 patients treated in our hospital from 1966 to March 1988. Cystectomy with omentoplasty is confirmed to be a simple and effective surgical method in operative treatment of echinococcosis.

Adolescent↗