Malignant tumors associated with nevus sebaceous: Therapeutic consequences

Nevus sebaceous has been considered a relatively infrequent and unimportant congenital hamartoma for plastic surgeons unless the lesions are so big th at they require a demanding defect closure. As the dignity of such tumors i s primarily benign and the malformed sebaceous glands are localized abnorma lly high in the dermis, the temptation is appealing not to excise these tum ors any more but to eradicate them by laser beam therapy. Yet a nevus sebac eous not only affects sebaceous glands but includes various other malformat ions of the affected skin and its appendages. In addition, different malign ant tumors may occur in nevus sebaceous. even in children and young adults. We encountered 4 such malignant tumors of 18 nevi sebaceous operated on fr om 1989 to 1997. All nevi had been unsuspicious macroscopically. In three p atients, one of them only 15 years old, an associated basal cell carcinoma was found. In the fourth patient there was a mixture of three additional tu mors, a cystadenoma, a keratoacanthoma, and a basal cell carcinoma, besides the sebaceous malformations. These findings have two consequences: first, to continue surgical treatment of nevus sebaceous instead of dermabrasion o r dermablation and to have the specimen examined histologically and, second , to excise such tumors as early in childhood as possible.