REPORT OF CASE
This is a report of a rare disease, which in this patient covered an unusually large area of the scalp.
Miss L. B., a 36-year-old white woman, was seen on May 29, 1953. She had a slowly growing lesion which had been present since birth over the right side of her scalp. Shortly after birth a lenticular, hairless, slightly elevated nodule was noted in the right parietal region. About five years ago the area grew until it had attained a diameter of between 2 and 3 cm. Growth to the present size has been during the past five years. The lesion is asymptomatic, although the patient occasionally "nervously picks" at the area.
On inspection a large, well-demarcated, elevated, mammillated, skin-colored, crescent-shaped lesion, with a few superficial punctate excoriations, covered much of the right parietooccipital region. A few scattered hairs were present throughout the area. The lesion extended