title: Incidental medullary thyroid carcinoma in sporadic hyperparathyroidism. An expansion of the concept of C-cell hyperplasia.
abstract: Two patients with sporadic primary hyperparathyroidism were found to harbor tiny medullary thyroid carcinomas. In addition, parafollicular-cell hyperplasia was recognized in one of these thyroids by the use of immunoperoxidase stain to localize calcitonin. The possible relationships between these lesions are discussed.
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000150:complications*; D006965:Hyperplasia / Q000150:complications; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D010280:Parathyroid Glands / Q000473:pathology; D010282:Parathyroid Neoplasms / Q000473:pathology; D013961:Thyroid Gland / Q000473:pathology*; D013964:Thyroid Neoplasms / Q000150:complications*; D013997:Time Factors