Metastatic low-grade endometrial stromal sarcoma of the sigmoid colon three years after hysterectomy

Figure 1 Colonoscopic picture showing a polypoid tumor in the sigmoid colon. The tumor was covered with normal lining crypts, but had slightly engorged vessels on the surface.

Figure 2 Microscopic picture of the surgical specimen showing dense proliferation of spindle-like cells with ovoid or round nuclei, dispersed chromatin and sparse cytoplasm, arranged in ill-defined whorls centered on small arterioles. These showed features similar to the primary uterine low-grade ESS.

Figure 3 Immunohistochemistry showing strong diffuse immunoreactivity of the nuclei of neoplastic cells for progesterone receptor.