Abstract

We encoutered 32 patients with organoid nevus in a 5 year period (1992-1996) at Prefectural Nobeoka Hospital. Six patients among these had secondary tumor originated on the organoid nevus. The patients comprised 4 men and 2 women (mean age ; 43.8years).
We reported two cases of basal cell epithelioma originated on the organoid nevus. Case 1: A 62-year-old man with a verrucous tumor on the alopetia measuring 28×15mm on the occipital region. Case 2: A 62-year-old woman with a black nodule measuring 20×20mm on the alopetia measuring 40×25mm on the temporal region. Surgical resections of these tumors were perfomed, and the lesions were pathologically diagnosed as basal cell epithelioma.