Biomedical subjects
Publications and source records attributed to S J Pomeranz.
Magnetic resonance imaging can provide unique advantages in evaluation of foot and ankle disorders. Among these advantages are lesion localization, sensitivity in differentiation, and evaluation of ligaments, tendons, and osseous abnormalities.
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We report our experience with seven cases of eosinophilic granuloma in which unusual and/or confusing features were encountered. These features include: histologic confusion with desquamative interstitial pneumonitis, diffuse histiocytic lymphoma, eosinophilic pneumonia; cysts filled with air and/or fluid; radiographic onset in the eighth decade of life; intratracheal mass; and focal parenchymal consolidation.
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Substernal gastric bypass has been recently revived to palliate unresectable esophageal carcinoma. We report an unusual postoperative complication of gastric bypass: recurrent pneumothorax responding to nasogastric tube decompression of a distended thoracic stomach.
Serial magnetic resonance imaging (MRI) and computed tomography (CT) were performed on a patient with metastatic lung cancer to brain. Magnetic resonance (MR) visualized two foci of intracerebral metastasis six weeks prior to CT.
Nests of granulocytic tumor cells in patients who have myelogenous leukemia are termed chloromas. Eight cases of chloroma seen on CT were reviewed. Lymph nodes, subcutaneous tissues, peritoneum, pleural space, pelvis, and portal hepatis were involved. Two patients exhibited chloroma as the sole manifestation of their disease during bone marrow remission. The extracranial appearance of chloroma on CT is that of small, nonenhancing, nodular densities that resemble lymphoma. Cranial involvement is characteristically in the orbit. The central nervous system appearance is variable, however, and high attenuation masses may occur that mimic lymphoma, hematoma, and metastatic neuroblastoma. The recognition of these lesions is important, since radiation, not chemotherapy, is often the preferred treatment for localized chloroma.
A chart for organizing, teaching, and recording the magnetic resonance (MR) pulse sequences used for brain and cervical spine imaging is described. The chart helps document workable sequences and facilitates comparisons between different sequences. It has also been helpful in instructing residents and fellows how to approach an MR examination logically.
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MR was performed on six patients clinically diagnosed as having neurofibromatosis. Owing to its multiplanar capability, MR greatly helped determine the extent of visual pathway disease. We attempted to find specific optimal pulse sequences for evaluating the prechiasmatic, chiasmatic, and retrochiasmatic visual system at 0.35 T. Using spin-echo techniques, we evaluated a T1-weighted sequence (TR 300 msec/TE 35 msec), an intermediate T2-weighted sequence (TR 1500 msec/TE 35 msec), and a T2-weighted sequence (TR 1500 msec/TR 70 msec). We found that the orbital and intracanalicular optic nerves were most accurately and easily seen with the T1-weighted sequence axially and coronally; the chiasm was best seen with the intermediate T2-weighted coronal sequence; and the retrochiasmatic visual pathway was optimally evaluated with T2-weighted spin-echo technique.