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Picture of the Month Quiz

A 9-year-old girl presented to our pediatric dermatology practice for evaluation of a congenital scalp lesion. Her new pediatrician had noted the scalp nodule on examination and subsequently referred her. Her family reported that at age 2 weeks, the nodule became erythematous and depressed. Thereafter, it gradually expanded and protruded as the patient grew. There was no history of pain, pruritus, breakdown, bleeding, or discharge from the site. The patient was delivered at full term by normal, spontaneous vaginal delivery, and she had no other significant medical history or medical symptoms. Her family history was also unremarkable.

Her physical examination revealed an approximately 1.5-cm pink, hairless nodule in the posterior midline of her scalp (Figure 1). Magnetic resonance imaging suggested the diagnosis (Figure 2).

Figure 1

Figure 1.

Figure 2

Figure 2.

What is your diagnosis?

For a complete discussion of this month's case, read next month's Picture of the Month—Quiz Case. For a complete discussion of last month's case, read this month's Picture of the Month—Quiz Case.