title: Primary hyperparathyroidism due to an oxyphil cell adenoma.
abstract: A 70-year-old black man was found to have primary hyperparathyroidism due to an oxyphil cell adenoma. Ultrastructural studies were essential in elucidating the cell type of the tumor. The morphologic findings in relation to the clinical findings and a brief review of the literature are discussed.
mesh_terms: D000236:Adenoma / Q000150:complications* / Q000648:ultrastructure; D000368:Aged; D006801:Humans; D006961:Hyperparathyroidism / Q000209:etiology*; D008297:Male; D010282:Parathyroid Neoplasms / Q000150:complications* / Q000648:ultrastructure