[Plasmocellular balanoposthitis of Zoon].

Plasma cell balinitis of Zoon is a well-defined and easily-recognized disease entity that is little-known in urology. Our clinical experience in 5 cases is reported herein. The uncommon presentation of this condition in a 12-year-old patient is underscored. The clinical picture, gross features of the typical erythroplastic plaque, the differential diagnosis with special reference to Queyrat's erythroplasia, and the characteristic histologic features are described. Our experience confirms the inefficacy of topical treatment with antiseptic agents and corticosteroids. Circumcision is still the only effective treatment of this disease.