Human papillomavirus type 6 associated Buschke-Loewenstein tumor (giant condyloma acuminatum).

The term "Buschke-Loewenstein tumor" has been used for tumors with exophytic, wart-like excrescences in the anogenital region. This broadly includes giant condyloma acuminatum and verrucous carcinoma. We report a 44-year-old Japanese man with a giant condyloma acuminatum Buschke-Loewenstein tumor on the right femoinguinal area. The lesion was a huge grape-like nodule composed of multiple small nodules, reaching 135 x 65 x 40 mm in size. Histologically, it showed a regularly acanthotic papilloma with numerous koilocytes in the upper squamous and granular layers. Ultrastructural findings included gradual differentiation from basal cell layers to uppermost corneocytes without disorganized relationships in the epithelial-stromal junction or cellular atypia. Human papillomavirus type 6 DNA was detected in the tumor tissues by polymerase chain reaction and restriction enzyme analysis, although immunohistochemical staining for papillomavirus common antigen was negative.