Polycythemia vera, primary hyperparathyroidism, and dysplastic nevus syndrome: report of a case.

Polycythemia vera and primary hyperparathyroidism is diagnosed in a patient with dysplastic nevus syndrome. A 59-year-old white man is noted to have numerous pigmented lesions found predominantly over the upper aspect of the back and chest. A biopsy revealed the atypical nevi found in dysplastic nevus syndrome. Over a 13-year period, three superficial spreading malignant melanomas were excised. The patient subsequently had polycythemia vera and primary hyperparathyroidism develop. Atypical pigmented skin lesions were not seen in family members, although two family members died of metastatic malignant neoplasms, one from endometrial carcinoma and the second from prostatic adenocarcinoma.