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American Journal of Roentgenology, Vol 153, Issue 2, 335-339
Copyright © 1989 by American Roentgen Ray Society

Articles

The radiologic manifestations of alveolar soft-part sarcoma

JG Lorigan, FN O'Keeffe, HL Evans, and S Wallace

Department of Diagnostic Radiology, University of Texas M. D. Anderson Cancer Center, Houston 77030.

Alveolar soft-part sarcoma is a rare soft-tissue tumor of unknown cellular origin that is characterized histologically by its organized "pseudoalveolar" pattern. The radiologic findings in 11 patients with this neoplasm were reviewed. The six men and five women were 16-48 years old (mean, 27 years). Nine patients had untreated primary tumors (thigh, four; forearm, two; and buttock, rectus abdominis muscle, and infratemporal fossa, one each) and two had locally recurrent masses (one each in the retroperitoneum and retrocrural space). All patients were evaluated by conventional radiography, two by sonography, eight by CT, five by angiography, and three by MR. Conventional radiographs showed the soft-tissue mass in only four patients; four lesions caused destruction of adjacent bone and two had soft-tissue calcification. Unenhanced CT showed low-attenuation lesions in four of five patients. The lesions were hypervascular on contrast-enhanced CT or angiography in each of nine patients studied. Prominent draining veins were shown by CT or angiography in five patients. Three lesions had a prolonged capillary stain on angiography. Alveolar soft-part sarcoma should be considered in the differential diagnosis of a hypervascular soft-tissue mass, particularly in the thigh of a young adult.
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