Infundibulocystic basal cell carcinoma.

A case of infundibulocystic basal cell carcinoma is reported. The patient was a 56-year-old Japanese woman. Clinically, the cutaneous lesion was a 2 x 4-mm, dark reddish, well-demarcated papule on the left nasal bridge. Histologically, it showed findings typical of the disease criteria described by Walsh and Ackerman, i.e., it was a well-circumscribed, superficially located, basaloid cell tumor with multiple cysts containing cornified cells lined by infundibular epithelium. It showed no follicular bulbs and papillae, and the stroma was not highly fibrocytic, although clefts within the connective tissues and abundant mucin were observed. The tumor was diagnosed as an infundibulocystic basal cell carcinoma.