Grossly, the tumor was white-gray in color and the cut surface displayed a whorled pattern. On the pole beneath the salpinx there was a cyst measuring 3 cm in greatest diameter filled with brownish material that was included in the tumor (A). Microscopically, the tumor was composed of whorled interlacing fascicles of typical smooth muscle cells, and the lumen of the cyst was covered with cuboidal epithelial cells surrounded by endometrial-type stroma (B, 40×, H&E). Immunohistochemically, the tumor cells were positive for desmin (C, 100×) and α-smooth muscle actin (D, 100×).
Tomas et al. Diagnostic Pathology 2009 4:25 doi:10.1186/1746-1596-4-25