Prostatic stromal hyperplasia with bizarre nuclei.

Prostatic stromal hyperplasia with bizarre nuclei is an uncommon variant of nodular hyperplasia that may be confused with mesenchymal malignancy but that can usually be distinguished by the degenerative character of the nuclear changes, absent to negligible mitotic rate, and relatively sparse cellularity. We report a case in a 73-year-old man and review six other cases, which, to our knowledge, are the only ones that have been reported previously.