Phyllodes type of atypical prostatic hyperplasia: a report of 3 new cases.

We report 3 new cases of phyllodes type of atypical prostatic hyperplasia. This lesion is characterized by epithelial and stromal proliferation. Stromal changes are the most characteristic finding in phyllodes type of atypical prostatic hyperplasia, which show atypical cells with enlarged, hyperchromatic sarcomatoid nuclei. Mitotic figures are not present. Although the histological appearance may mimic that of cystosarcoma phyllodes of the breast, this pattern is present only focally or not at all in phyllodes type of atypical prostatic hyperplasia. On computerized tomographic imaging phyllodes type of atypical prostatic hyperplasia has a distinct appearance. These patients can be expected to have a benign clinical course and distant metastases have not been reported. Treatment is by surgical excision as in benign prostatic hyperplasia.