Necrobiosis Lipoidica Diabeticorum of the Abdomen

The teaching of dermatology on a basis of regional anatomy has been developed to a point where an entire book has been devoted to it.1This leads to stereotyped classifications, which may exclude a disease on the basis of the site of involvement. As an example, we wish to present a case of necrobiosis lipoidica diabeticorum of the abdomen, refuted because of the unusual location by several competent dermatologists when the case was presented at a regional dermatological meeting. Report of a Case History.— A 19-year-old white woman first developed a small erythematous lesion on the right leg about 5 months before she was seen by one of us (J.S.S.). The original lesion slowly increased in size, and new lesions gradually appeared over the succeeding months. Most of the new lesions were located on the abdomen near the umbilicus, while a few lesions developed on the right thigh. Past