At times dermatologists observe cutaneous conditions that defy definite classification. One such instance was seen nearly 20 years ago. Increased experience and reading have failed to solve this problem. However, in 1955, Jaeger, Delacretaz, and Chapius1 presented a case under the title of ``Segmentary Paravertebral Cutaneous Atrophy'' that resembled the dermatosis under consideration. Their patient was a 66-year-old woman who had an area of sclerodermalike atrophy in the region of the dorsal nerves VII and VIII of many years' duration. The illustration accompanying this presentation had certain features in common with the herein reported case.
Report of Case*
A Negro woman aged 48 years, was seen first on June 1, 1938. She stated that when she was 3 years old, her mother had noted a dark spot on her left side, which had been enlarging slowly since. At 10