Diamond-Gardner syndrome: a case report.

We present a 13-year-old girl who came to our attention for an erythematous bruised lesion which appeared spontaneously without any apparent coagulopathy. The history, histology, and positive "skin-test," carried out by subcutaneously injecting autologous erythrocytes obtained from heparinized blood, confirmed the suspected diagnosis of Diamond-Gardner syndrome. No alterations of blood vessel walls or thromboses were found. Evaluation of hemocoagulative parameters revealed an increased factor VIII level and reduced platelet aggregation after stimulation by adenosine diphosphate (ADP.)