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Biomedical subjects

T Rettenbacher

Publications and source records attributed to T Rettenbacher.

7 recordsLinked to original sources
PubMed1997

New signs of breast cancer: high resistance flow and variations in resistive indices evaluation by color Doppler sonography.

In a prospective study, color Doppler sonograms (CDS) were performed in 142 patients with solid breast lesions (64 carcinomas, 53 fibroadenomas, 25 miscellaneous breast diseases). Exclusively intratumoral RI were determined, with only the highest and lowest value in the various vessels of a tumor being considered. We found that an RI < 0.80 is typical for benign breast conditions, but also frequently occurs in malignant lesions. A significant difference was seen for higher RIs. An RI > or = 0.80 was seen to be an indicator of malignancy with high specificity (96%) and a sensitivity of 55%. Moreover, RI differences in malignant lesions were markedly greater than in benign lesions. An RI difference > or = 0.20 among vessels of one tumor was a malignancy indicator with very high specificity (97%) but relatively low sensitivity (39%). An RI > or = 0.80 and RI differences > or = 0.20 are specific Doppler ultrasound (US) malignancy indicators.

Adult↗
PubMed1997

[Ultrasonography of the normal vermiform appendix].

AIM: To study the detectability and the appearance of the vermiform appendix with ultrasound in asymptomatic adults. METHODS: A prospective study was performed on 300 patients, selected without regard to age, sex and weight. We tried to visualize the appendix with a 3.5 MHz annular array and a 5 MHz linear array transducer. RESULTS: In 63% of the patients the appendix was clearly visualised. The main reasons for non-visualisation were obesity with insufficient ultrasound penetration (38%) and the caecum laying in pelvic or atypical position (24%). In 31%, no cause was apparent but we assume that the appendix often lies behind the caecum. The sonographic image showed an aperistaltic target originating at the caecum, and ending blindly. In 42% of cases the appendix was ovoid in transverse section; in 32%, round; and in 26% both forms were found within one appendix. Intraluminal gas was visible in 86%. The mean transverse diameter was 5.2 mm (min. 3 mm, max. 13 mm) and in 76% the transverse diameter was lower than 6 mm. CONCLUSION: The sonographic detectability, the appearance and the size of the normal appendix show considerable variations.

Adult↗
PubMed1996

[Spontaneous fatty tissue necrosis of the omentum majus and epiploic appendices: clinical, ultrasonic and CT findings].

UNLABELLED: To describe US and CT findings of primary epiploic appendicitis and segmental infarction of the omentum. MATERIAL AND METHODS: From 1986 through 1996 thirteen patients presented with these pathological findings at our institution (6 patients with greater omental infarction and 7 patients with epiploic appendicitis). US (n = 13) and CT findings (n = 7) were retrospectively reviewed. RESULTS: US revealed moderately hyperechoic, ovoid lesions adherent to the peritoneum. On CT scans the masses appeared as areas of fat with slightly increased attenuation and sometimes with hyperattenuating peripheral rims. Secondary omental or appendiceal involvement caused by inflammation of adjacent organs has to be excluded. CONCLUSION: Segmental infarction of the omentum and primary epiploic appendicitis have characteristic US and CT features that enable the correct diagnosis.

Adipose Tissue↗
PubMed1995

[Diagnostic imaging in arthrosis deformans of the peripheral joints].

Conventional radiology is the most important diagnostic imaging method for the arthrosis deformans of the little peripheral joints, sometimes radionuclide bone imaging is used as a supplement. We deal with the classification and the radiological signs of the arthrosis deformans in general and of the peripheral joints in particular. Great importance is attached to typical findings and finding constellations in text and pictures. We try to explain the complex differential diagnosis and the implication with other disorders of the joints in a brief and poignant way.

Cartilage, Articular↗