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KMID : 0338420120270010091
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The Korean Journal of Internal Medicine
2012 Volume.27 No. 1 p.91 ~ p.94
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Ewing’s Sarcoma of the Lesser Sac Masquerading as a Pancreatic Tumor
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Lakshmi Rao
Vidya Monappa
Gabriel Rodrigues
B P Suresh
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Abstract
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Extraosseous Ewing’s sarcoma/primitive neuroectodermal tumor (ES/PNET) is an uncommon, aggressive, and malignant tumor with a poor patient outcome. Its occurrence in the lesser sac is a rare event and to the best of our knowledge, has not been previously described. The present case was clinically and radiologically misdiagnosed as a pancreatic tumor/gastrointestinal stromal tumor. Histopathology revealed a tumor with “small round cells” that were positive for CD99, confirming the diagnosis of ES/PNET. This report highlights the importance of considering Ewing’s sarcoma in the differential diagnosis of intraabdominal, extraintestinal masses.
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KEYWORD
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CD99 protein, Sarcoma, Ewing, Extraosseous, Neuroectodermal tumors, primitive
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