Primary Mesenteric Undifferentiated Pleomorphic Sarcoma Masquerading as a Colon Carcinoma: A Case Report and Review of the Literature

Figure 2

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.