title: Cystic parathyroid gland hyperplasia--hyperparathyroidism presenting as a neck mass.
abstract: Hyperparathyroidism may occasionally present as a neck mass resulting from cystic change in a parathyroid adenoma. We report an unusual instance of hyperparathyroidism presenting as a palpable, but asymptomatic hyperplastic parathyroid gland cyst. We conclude that hyperplastic parathyroid glands may undergo cystic degeneration resulting in a palpable neck mass; and that all functional parathyroid gland cysts are not necessarily adenomas. Therefore, during parathyroidectomy procedures, biopsy material from at least one additional parathyroid gland should be obtained.
mesh_terms: D000368:Aged; D003560:Cysts / Q000150:complications / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D006962:Hyperparathyroidism, Secondary / Q000209:etiology* / Q000628:therapy; D006965:Hyperplasia / Q000150:complications; D010279:Parathyroid Diseases / Q000150:complications / Q000473:pathology* / Q000601:surgery