case_images: PMC4563063_01
case_images: 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.
case_images: CRIONM2015-532656.001.jpg
case_images: PMC4563063_01_CRIONM2015-532656.001.jpg
case_images: fig1
case_images: 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).
case_images: 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.
case_images: CRIONM2015-532656.002.jpg
case_images: PMC4563063_01_CRIONM2015-532656.002.jpg
case_images: fig2
case_images: The malignant cells formed different morphological patterns, from highly cellular epithelioid areas to pleomorphic-storiform areas (Figure 2).
case_images: 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.
case_images: CRIONM2015-532656.003.jpg
case_images: PMC4563063_01_CRIONM2015-532656.003.jpg
case_images: fig3
case_images: The immunohistochemical studies performed only showed a high positivity to vimentin and focal positivity to CD68 (Figure 3).