This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Incontinentia Pigmenti. Presented by Dr. G. Marshall Crawford, Boston, and Dr. C. R. Damiani, Worcester, Mass. A 4 year old white girl of American birth, P. W., is presented with an eruption on the trunk and upper part of the thighs present since early infancy. At about the age of 3 months, pigmented streaks were seen on the back of the upper part of the thighs. These gradually became more pronounced and extended upward, eventually involving the back and abdomen. A year ago, when the patient had measles, the pigmented areas were observed to become scarlet; after recovery the areas gradually returned to the previous shade of brown. No other member of the family has been affected by any similar condition. There was no history of congenital anomalies; the child had a normal developmental history and was mentally alert. Examination reveals a pigmentary disturbance approximating the "bathing suit" distribution. The