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Picture of the Month Quiz

A 9-year-old white boy presented with unruly hair since birth. Although his hair appeared to have normal growth without excessive loss or increased brittleness, it did not maintain its shape after styling. His older sister had experienced similar hair problems during childhood (Figure 1) but the condition had disappeared spontaneously with puberty. The hair of the other immediate family members was normal.

On examination we observed that the patient's entire scalp was covered with yellowish, dry, frizzy hair that projected outward and resisted any attempt to flatten it. The results of the rest of the clinical examination were unremarkable. On dermoscopy and electron microscopy, a longitudinal grooving and a triangular shaft were found in examined hairs (Figure 2).

Image of a 9-year-old white boy presented with unruly hair since birth

Figure 1.

Image of a 9-year-old white boy presented with unruly hair since birth

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.