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John G. Albertini, MD; Michele Maroon, MD; William B. Tyler, MD
Geisinger Medical Center, Danville, Pa

Arch Dermatol. 1999;135:707-712.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

REPORT OF A CASE

A 62-year-old white man presented with suspected cholesterol emboli. A discrete 2.5-cm pink, firm nodule was incidentally noted on the vertex of his scalp (Figure 1). Blue-gray pigmentation was noted at the inferior portion of the nodule. The lesion, which was asymptomatic, was present for more than 20 years. A punch biopsy specimen was obtained (Figure 2, Figure 3, and Figure 4).

Figure 1.

Figure 2.

Figure 3.

Figure 4.

What is your diagnosis?

Diagnosis

The clinical differential diagnosis included cylindroma and pigmented basal cell carcinoma. The biopsy specimen showed large nodular aggregates of basaloid cells with peripheral palisading and abundant melanin. At the periphery, some basaloid cells appeared to recapitulate primitive follicular germs (Figure 4). There was no epidermal attachment. The nodules were surrounded by a fibrous connective tissue stroma in . . . [Full Text of this Article]

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