Pagetoid Bowen Disease Initially Misdiagnosed as Ectopic Extramammary Paget's Disease.

Pagetoid Bowen disease is a histological variant of Bowen disease which demonstrates large pale staining cells (pagetoid cells). It requires differential diagnosis from other cutaneous malignancies with similar patterns, such as extramammary Paget's disease (EMPD) and Pagetoid melanoma . Herein, we report a case of Pagetoid Bowen disease which was initially misdiagnosed as ectopic EMPD.