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Biomedical subjects

S Schick

Publications and source records attributed to S Schick.

26 records · Page 2Linked to original sources
PubMed1997

Coaxial technique: approach to breast core biopsies.

PURPOSE: To assess the feasibility of the coaxial core breast biopsy technique performed under stereotactic and ultrasound (US) guidance in vitro and in vivo. MATERIALS AND METHODS: Biopsies were performed in vitro and in vivo with a coaxial technique. In vitro, the true needle-tip deviation was measured with a breast phantom on a stereotactic device with alteration of x and y axes. In vitro US studies were performed to evaluate the optimal technique for harvesting sufficient material for histologic work-up. In 205 patients, coaxial biopsy was performed in 210 suspicious lesions under US (61 lesions) or stereotactic (patient in the sitting position, n = 67; patient in the prone position, n = 82) guidance. In addition, the coaxial system was used for preoperative localization. Surgery and histologic work-up were performed in all cases. RESULTS: In vitro, the true needle-tip deviation was found to be less than indicated on the stereotactic device. A factor was introduced to correct this error. For US guidance, angulation or rotation of the coaxial needle within the lesion proved to be the best technique to increase the size of histologic specimen. Of the 210 lesions, 112 were benign and 98 were malignant. Agreement between biopsy results and final postsurgical histologic analysis was found in 205 cases (98%). CONCLUSION: The coaxial breast biopsy technique is an accurate, simple, and time-saving method performed under stereotactic or US guidance.

Adult↗
PubMed1996

Randomized comparison of sitting and prone positions for stereotactic fine-needle aspiration breast biopsy.

In a prospective randomized study, 103 women had stereotactic biopsies performed either in the prone (n = 51) or sitting (n = 52) position. Questionnaires were administered before and after biopsy, to measure anxiety, pain and subjective experience in all patients. Vasovagal reactions were scored from 0 to 2 according to severity. There was no significant difference between biopsies performed in the sitting or the prone position with regard to overall tolerance. Significantly more patients biopsied in the prone position (15 of 51, 29 per cent) than in the sitting position (seven of 52, 13 per cent) would prefer premedication before a repeat biopsy (P = 0.04). Of the total patient group, three women fainted, one in the prone position and two others in the sitting position. Breast biopsies performed in the prone or sitting position are equally well tolerated. Somatic reactions such as fainting are not a major problem during breast biopsy; however, attention should be focused on patient care, including information given before the procedure.

Anxiety↗
PubMed1995

Recurrent suppurative thyroiditis due to pyriform sinus fistula: a case report.

Acute suppurative thyroiditis is a rare disease, particularly in childhood. We present a case with recurrent acute suppurative thyroiditis due to a pyriform sinus fistula originating from the fourth branchial pouch. The typical symptoms of a pyriform sinus fistula are recurrent left-sided pain and swelling of the neck with signs of acute bacterial inflammation. Diagnosis should be made by high resolution ultrasound, barium meal studies and endoscopic examination. During acute exacerbations treatment with antibiotics is indicated, but permanent cure can only be attained by complete fistulectomy.

Acute Disease↗
PubMed1995

[MR-pool: the "Vienna blend". An interactive computer-assisted teaching system for MRI].

Advances in the field of computer technology have facilitated the development of computer-assisted instruction. In this paper we present an interactive computer-based MR teaching system for education in radiology. Our program contains 120 teaching files. Various MR sequences can be displayed and compared to conventional X-ray images, CT, angiography and scintigraphy. Using a text field, additional clinical and diagnostic hints are offered. This teaching file can be easily upgraded and distributed on CD-ROM. Furthermore, we compare computer-assisted teaching in general to other conventional instruction media.

Austria↗
PubMed1993

[Pseudolesions in liver sonography].

Several common hepatic ultrasound pseudolesions are presented that may closely resemble pathological conditions. The majority of these pitfalls is caused by normal anatomic structures, anatomical variants of the liver or the perihepatic regions, and benign alterations of the echotexture of the liver. Exact knowledge and a precise scanning technique by an experienced sonographer are essential to avoid mistaking such findings for true liver disease. In some instances (especially when dealing with anatomical variants) computed tomography is also helpful.

Diagnosis, Differential↗
PubMed1982

Errors in the center and angle of rotation of a joint: an experimental study.

The error sensitivity in the determination of center and angle of rotations of a body joint performing planar motion is studied. A simple experiment is described to measure the errors in these two kinematic parameters as functions of errors in the input coordinates of markers. The effect of varying the marker locations and the size of motion-step is also studied. The errors in the center of rotation are found to increase dramatically when the two markers subtend angles of about 0 deg or 180 deg and when the motion step size decreases to 1 deg or less. Similar results are found for errors in the angle of rotation which, in addition, increase with decrease in the radius of the markers.

Biomechanical Phenomena↗
PubMedDate not supplied

Atypical appearance of elastofibroma dorsi on MRI: case reports and review of the literature.

Three patients with histologically proven elastofibroma dorsi underwent MRI, using T1-weighted, T2-weighted, STIR (short inversion time inversion recovery), and contrast-enhanced SE sequences. All lesions typically displayed low signal intensity masses interspersed with areas of high signal intensity on T1- and T2-weighted SE images. Contrary to prior reports, two patients showed marked enhancement of the mass after administration of Gd-DTPA. Although the characteristic signal intensity on conventional T1- and T2-weighted images may lead to the early diagnosis of this rare tumor, radiologists should be aware that marked contrast enhancement may be representative in elastofibroma dorsi.

Female↗