REPORT OF A CASE
A 68-year-old man presented with a 1-month history of change within a lifelong lesion on his left cheek.The patient reported the growth of a new nodule, which he had noticed bled with minimal trauma.Examination revealed a 1.5×1.0-cm poorly marginated, reddish, and somewhat translucent nodule arising within a 3-cm linear, orange yellow plaque that had a cobblestonelike texture (Figure 1). A biopsy specimen was taken (Figure 2). Tissue from the subsequent excision was also examined microscopically (Figure 3).What is your diagnosis?
Squamous cell carcinoma arising in a nevus sebaceus of Jadassohn (NSJ).
HISTOPATHOLOGIC FINDINGS AND CLINICAL COURSE
The biopsy specimen of the nodular lesion showed an infiltrating, keratinizing, epithelioid tumor arising from the epidermis. There was a moderately intense lymphocytic inflammatory response surrounding the tumor. The subsequent excision specimen revealed a dilated follicular infundibulum filled with keratinous material, subtle