[A case of von Recklinghausen's disease localized in the lower abdominal and external genitalia].

A case of von Recklinghausen's disease localized to the lower abdominal and the external genital region is reported. The patient was a 14-year-old male who complained of an abnormality of the external genitalia. There was a subcutaneous mass with the skin pigmentation, which surrounded the penis, so that the foreskin appeared like a cyst. Excision of the subcutaneous mass and plastic operation of the penis were performed. Histological examination showed it to be diffuse neurofibroma. There has been no recurrence two years after the operation. This type of von Recklinghausen's disease has not been reported in Japan.