Figure 1.

Prostatic stromal sarcoma: histological features. a) The tumor contained elongated-spindle cells with a rich vascular network and two prostatic glands (*) embedded in the proliferation. b) At higher power, cytologic atypia and mitoses were seen. c) Desmin immunostaining showed some positive cells. d) Myogenin was negative. Strong and diffuse immunostaining for CD34 (e) and nuclear staining for progesterone receptor f) in more than 40% of cells. g) Scattered cells with hypercromic nuclei and occasional multinucleated cells. h) Higher power highlights the cytologic detail. In the center a multinucleated cell simulating a rhabdomyoblast.