PMC3598680_01
Macroscopic views of the resected small bowel, where the tumor is noted (arrow). (A) Tumor causing adhesion of the adjacent small bowel loop. (B) Intraluminal view, where the tumor causes circumferential-eccentric wall thickening of nodular formation, and thus concentric luminal narrowing.
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F1
At the point of obstruction, adhered loops of small intestine were found (Figure  1).
Tumor infiltrates the small bowel (hematoxylin-eosin staining x 40).
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F2
The mitotic rate was approximately eight mitoses per 10 high power fields (Figures  2 and 3).
Clear cell sarcoma. Nests of epithelioid cells with eosinophilic or clear cytoplasm (hematoxylin-eosin staining x 200).
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F3
The mitotic rate was approximately eight mitoses per 10 high power fields (Figures  2 and 3).
Neoplasmatic cells with positive expression of S-100 protein (S-100 staining x 100).
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F4
The immunohistochemical profile of the tumor was positive for S-100 protein (Figure  4), focally positive for epithelial membrane antigen (EMA) and weakly positive for synaptophysin at some locations and negative for pankeratins AE1/AE2, GFAP, HMB45 and MART-1.