PMC4563063_01
A CT scan shows a heterogeneous, well-circumscribed mass in the right abdominal loin that seems to originate from the hepatic flexure colon and descends towards the anterosuperior iliac spine. Note the presence of air bubbles due to the colonic invasion.
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fig1
A full-body CT scan revealed a heterogeneous, well-circumscribed mass in the right abdominal loin that seemed to originate from the hepatic flexure colon and descended towards the anterosuperior iliac spine (Figure 1).
H&E stain (100 hpf). A poorly differentiated mesenchymal tumour, with ample zones of necrosis and with an extensive mononuclear inflammatory component. The malignant cells form different morphological patterns, from highly cellular epithelioid areas to pleomorphic-storiform areas. The malignant cells are large, with highly atypical nuclei.
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The malignant cells formed different morphological patterns, from highly cellular epithelioid areas to pleomorphic-storiform areas (Figure 2).
Immunohistochemical analysis: The malignant cells show strong positivity to vimentin and focal patchy positivity to CD68, a nonspecific marker of fibrohistiocytic differentiation. S100 expression was negative.
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The immunohistochemical studies performed only showed a high positivity to vimentin and focal positivity to CD68 (Figure 3).