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  • Title: Fine needle aspiration cytology of cystic parathyroid lesions. A cytomorphologic overlap with cystic lesions of the thyroid.
    Author: Layfield LJ.
    Journal: Acta Cytol; 1991; 35(4):447-50. PubMed ID: 1927181.
    Abstract:
    Three cases of palpable cystic parathyroid nodules examined by fine needle aspiration (FNA) cytology are reported. Two of the three aspirates were incorrectly identified as thyroid neoplasms due to the presence of papillary clusters or microfollicles and grossly golden-brown cyst fluid. Histologic examination of these two nodules revealed partially cystic parathyroid adenomas. Aspirated material from the third patient yielded clear watery fluid, which was correctly identified as consistent with a parathyroid cyst. The diagnostic difficulties in the differentiation of parathyroid adenoma from thyroid carcinoma or adenoma are discussed, as is the utilization of assays for parathyroid hormone in making the FNA diagnosis of parathyroid lesions.
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