PMC3638502_01
Computed tomography (CT) of the abdomen. (a) Coronal section and (b) axial section showing a huge 12.8 x 10.2 x 13.1 cm heterogeneous, aggressive-looking intraperitoneal pelvic mass lesion, most likely arising from intestinal ileum, with areas of lobulations, hemorrhagic cystic changes, gas locules, fluid-fluid levels, and proximal small bowel dilatation due to partial obstruction.
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An abdominal computed tomography (CT) scan showed a huge 12.8 x 10.2 x 13.1 cm heterogeneous, aggressive-looking intraperitoneal pelvic mass lesion, most likely arising from intestinal ileum, with areas of lobulations, hemorrhagic cystic changes, gas locules, fluid-fluid levels, and proximal small bowel dilatation due to partial obstruction (Figures 1(a) and 1(b)).
Histopathology of the excised intestinal ileum tumor. (a) Low power view showing multinodular growth. (b) Branching vascular channels lined by endothelial cells and interspersed by uniformly round to ovoid glomus cells forming nest, sheets, and trabeculae. (c) Area of geographic tumor cell necrosis. (d) Hypercellularity with distinct cell borders. (e) Areas of hypercellularity with mild atypia. (f) Focal spindled cells with scattered mitosis.
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Mitotic activity was approximately 4-5/50 high-power field (HPF) (Figures 2(a)-2(f)). 
Immunohistochemistry of excised intestinal ileum tumor. (a) Tumor cells are positive for alpha smooth muscle actin (alpha-SMA). (b) Uniform pericellular type IV collagen expression.
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The tumor cells were negative for CD117, CD34, cytokeratin, S100, desmin, human melanoma black-45 (HMB-45), chromogranin, and synaptophysin (Figures 3(a) and 3(b)).