Case Report: Extramedullary Hematopoiesis in the Prostate.

Extramedullary hematopoiesis is the physiological process of hematopoiesis occurring outside of the bone marrow and is an extremely rare occurrence in the prostate, with only 1 previously documented report in the English literature. We present a specimen from a 56-year-old man who was found to have a palpable nodule on digital rectal examination and visible findings on ultrasound, confirmed to be extramedullary hematopoiesis on the prostate core.