J Clin Aesthet Dermatol 2019 Mar 1;12(3):40-43. Epub 2019 Mar 1.
Drs. Paninson, Trope, and Ramos-e-Silva are with the Sector of Dermatology, Postgraduation Course in Dermatology at the University Hospital and School of Medicine, Federal University of Rio de Janeiro in Rio de Janeiro, Brazil.
The nevus sebaceous of Jadassohn, usually present at birth, is a hamartoma composed predominantly of sebaceous glands, which can progress to benign and malignant tumors. Malignant neoplasms on the nevus sebaceous occur in about 2.5 percent of cases, with basal cell carcinoma accounting for 1.1 percent. Suspected cases of transformation should be clinically monitored and excised. We report the case of a 38-year-old man with a yellowish plaque located in the left parietal region, present from birth, on which a brownish papular lesion developed. The histopathological examination showed that it was a basal cell carcinoma. In presenting this case of basal cell carcinoma on a nevus sebaceous, we emphasize the evolutionary possibilities in order to improve prompt diagnosis and correct treatment.