Prostate stromal tumor with prostatic cysts after transurethral resection of the prostate: A case report

Figure 3 Postoperative histological examination. A: Postoperative histological examination revealed prostatic stromal tumor with considerable, diffused proliferation of heterotypic interstitial cells without any characteristic arrangement. Such tissues consisted of irregular vacuolated spindle cells with abundant eosinophilic cytoplasm and a hyperchromatic nucleus. In addition, the nucleus was slightly enlarged with a few visible nuclear grooves (arrowheads). Tumor cells exhibited mostly round-like and short spindle-like morphology with evident heterotypic and inconspicuous nucleoli. Signs of mitotic activity were relatively abundant and accounted for approximately 7/10 fields in selected active cell growth regions (hematoxylin and eosin stain, 400 × magnification). B: Immunohistochemistry revealed that the tumor cells were diffusely positive for CD34; C: The cells were focally positive for Ki-67 (immunohistochemical stain, 200 × magnification).