Cyto-morphological features of parathyroid lesions: Fine-needle aspiration cytology series from an endocrine tumor referral center.

Background: Descriptions of parathyroid cell cyto-morphology are limited. Fine-needle aspiration cytology (FNAC) with immunocytochemistry (ICC) or biochemical PTH measurements may help verify the parathyroid origin in extraordinary cases, although these methods are nowadays largely replaced by imaging techniques.

Methods: We collected all available FNAC reports of parathyroid lesions from our department spanning 20 years, to characterize the clinical use of parathyroid FNAC, and to assess morphological correlates between cytology and subsequent histopathology.