1.Ewing's Sarcoma of the Lesser Sac Masquerading as a Pancreatic Tumor.
Lakshmi RAO ; Vidya MONAPPA ; Gabriel RODRIGUES ; B P SURESH
The Korean Journal of Internal Medicine 2012;27(1):91-94
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.
Antigens, CD/analysis
;
Biopsy
;
Cell Adhesion Molecules/analysis
;
*Diagnostic Errors
;
Female
;
Humans
;
Immunohistochemistry
;
Middle Aged
;
Neuroectodermal Tumors, Primitive, Peripheral/*diagnosis/immunology/pathology/therapy
;
Pancreatic Neoplasms/*diagnosis
;
Peritoneal Neoplasms/*diagnosis/immunology/pathology/therapy
;
Predictive Value of Tests
;
Sarcoma, Ewing/*diagnosis/immunology/pathology/therapy
;
Tomography, X-Ray Computed
;
Tumor Markers, Biological/analysis