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Biomedical subjects

J Zeiss

Publications and source records attributed to J Zeiss.

At least 37 records · Page 2Linked to original sources
PubMed1990

Normal magnetic resonance anatomy of the tarsal tunnel.

Images of five cadaver ankles and three normal volunteers were obtained in an attempt to delineate magnetic resonance (MR) anatomy of the tarsal tunnel. Multiplanar T1-weighted (TE 20 msec, TR 600 msec) scans were obtained of the cadaver specimens while T1 and T2 weighted (TE 20, 80 msec, TR 2000 msec) scans were obtained of the volunteer ankles. After imaging, the cadaver ankles were frozen, sectioned, photographed, and compared to the MR images in the transverse plane. The anatomical structures seen on the MR images correlated closely with the cadaver sections. The bony and soft tissue boundaries and contents of the tarsal tunnel could be imaged with detail easily sufficient to delineate all the major structures within it, including the posterior tibial nerve and its branches.

Ankle↗
PubMed1990

CT of the abdomen after the Whipple procedure: value in depicting postoperative anatomy, surgical complications, and tumor recurrence.

We performed a retrospective study of CT scans in 29 patients who had undergone the Whipple procedure (radical pancreaticoduodenectomy) to study the CT appearance of the postsurgical anatomy and assess the use of CT in the evaluation of early postoperative complications and recurrent tumor. In the postoperative period, the scans from 15 patients revealed seven transient fluid collections; four deep abscesses, three of which were successfully drained under CT guidance; three superficial abscesses; and five cases of ascites. In 19 patients, CT scans were obtained up to 4 years after surgery to search for recurrent tumor. The most frequent site of recurrence was the liver. CT correctly identified liver metastases in six of seven patients and was falsely positive in one. Recurrence also was found twice in retroperitoneal lymph nodes; one time each in the mesenteric root, spleen, and lung base; and twice causing afferent loop blockage. Surgical proof of recurrence was obtained in eight cases. Our experience suggests that an understanding of the normal postoperative anatomy following the Whipple procedure is essential in evaluating postoperative CT scans. Scans obtained for detection of tumor recurrence should be optimized for imaging the liver because this was the most frequent site of recurrence.

Adult↗
PubMed1989

Role of scintigraphy in establishing optimal perfusion in hepatic arterial infusion pump chemotherapy.

Since 1982, physicians at the Medical College of Ohio, Toledo, have performed 41 hepatic intraarterial chemotherapy infusion pump implantations for palliative treatment of metastatic liver disease from various primary tumors of the gastrointestinal tract. Radionuclide hepatic arterial pump imaging has proven to be a very reliable, cost-effective, and uncomplicated method of evaluating liver perfusion as it relates to pump function, catheter integrity, and positioning. Confirmation of satisfactory hepatic perfusion is the key to acceptable treatment by this modality. In combination with periodic computed tomography (CT) scanning and CEA determinations, scintigraphy plays a major role in establishing effective therapy and aids in determining causal factors behind treatment failures.

Adult↗
PubMed1989

Anatomic relations between the median nerve and flexor tendons in the carpal tunnel: MR evaluation in normal volunteers.

To ascertain the dynamic changes between the median nerve and flexor tendons in the carpal tunnel, MR images of 16 wrists in eight volunteers were studied in flexion, extension, and neutral positions. T1-weighted axial images, 600/20 (TR/TE) were obtained with the wrists straight, extended at 45 degree, and flexed at 45 degree. Each scan was evaluated with regard to positional changes of the median nerve and flexor tendons in the carpal tunnel as well as alterations in nerve shape. In the neutral position, the median nerve was found in one of two standard positions: either anterior to the superficial flexor tendon of the index finger or interposed more posterolaterally between this tendon and the flexor pollicis longus. During extension, the nerve always maintained or assumed an anterior position between the superficial index finger flexor and the flexor retinaculum, while the flexor tendons moved posteriorly. With flexion, the tendons shifted anteriorly toward the retinaculum, and the median nerve was found in one of three positions. It either remained in its anterior position between the superficial index finger flexor and retinaculum or became interposed between the superficial flexor tendons of the index finger and thumb or middle finger and ring finger. Nerve shape varied with its position. Anteriorly positioned nerves were flattened in the anteroposterior plane between the tendon and flexor retinaculum; this was greatest with flexion and least with extension. Interposed nerves were flattened in the mediolateral plane or rounded in configuration. In conclusion, the alignment of the median nerve in the carpal tunnel, its shape, and its relationship to the flexor tendons were variable and dependent on wrist positioning. These findings may explain why certain wrist motions, flexion in particular, predispose a person to carpal tunnel syndrome.

Adult↗
PubMed1989

Magnetic resonance imaging in the diagnosis of anterior tibialis muscle herniation.

Magnetic resonance imaging (MRI) can be employed to successfully image the fascial compartments of the leg. Herniated muscle tissue and fascial discontinuity can each be unequivocally identified. Both the extent of fascial splitting and the size of the muscle herniation can be demarcated and quantified. MRI is favored over computed tomography because of its superior ability to distinguish soft-tissues structures, making it possible to see both muscle and fascia separately.

Hernia↗
PubMed1987

Iliopsoas hypertrophy mimicking acute abdomen in a bodybuilder.

Marked hypertrophy of the psoas muscle in a bodybuilder produced a unilateral extrinsic mass effect upon the medial cecum and adjacent small bowel. The patient had presented with right lower quadrant pain and leukocytosis. Routine contrast studies of the abdomen were misleading, but a computed tomogram suggested the correct diagnosis.

Abdomen, Acute↗
PubMed1984

Percutaneous catheter drainage in treatment of urinary extravasation.

In the last two decades there has been a rapid growth in the percutaneous manipulation of the genitourinary tract. We would like to present 2 patients in whom CT-guided percutaneous drainage of urinary extravasation was employed successfully and review the pertinent literature.

Adult↗
PubMedDate not supplied

CT presentation and staging accuracy of pancreatic adenocarcinoma.

In a retrospective study of 56 patients with surgically confirmed adenocarcinoma of the pancreas, the authors analyzed the efficacy of contrasted CT examination in the staging of tumor resectability and unresectability. Resectability was defined as strictly intrapancreatic disease; unresectability as locally invasive or metastatic disease. Of the 56 patients, 49 (88%) were found to be unresectable, and only seven (12%) were considered potentially resectable on the basis of CT evaluation. When these findings were compared to surgical findings, only one of the 49 CT unresectable patients was considered surgically resectable; all others showed advanced disease, with 30 of 49 (61%) having surgical findings comparable to CT findings, and 18 of 49 (37%) having more extensive disease at surgery than at CT. Of the 7 patients judged resectable by CT, only two (29%) were found to have local disease at surgery; three were locally invasive, one had positive nodes, and one had liver metastases. This study would suggest that CT can be very reliable in distinguishing advanced disease from confined intrapancreatic lesions (unresectability), but is not reliable for predicting locally confined disease (resectability). In particular, CT seems to be ineffective in demonstrating the full extent of pancreatic carcinoma, either unresectable or resectable, because of its inability to demonstrate microscopic local and nodal invasion and surface metastases.

Adenocarcinoma↗
PubMedDate not supplied

Post-traumatic synovitis presenting as a mass in the suprapatellar bursa of the knee. MRI appearance.

A lobulated mass in the suprapatellar bursa of the knee is presented with MRI findings simulating the features of focal pigmented villonodular synovitis (PVS). Microscopic examination demonstrated a nonspecific, inflammatory mass of hypertrophied synovium. The MRI features of various forms of synovitis are reviewed from recent literature and differential considerations of a suprapatellar, intrabursal mass are discussed.

Accidents, Traffic↗