title: Intrathyroidal parathyroid adenoma: Diagnostic pitfalls on fine-needle aspiration: Two case reports and literature review.
abstract: Parathyroid adenomas may occur within the thyroid, clinically simulating thyroid nodules. Fine-needle aspiration (FNA) of these presumably "thyroid nodules" can lead to misinterpretation of cytomorphological findings because of similarities in cytological features of parathyroid and thyroid lesions. Here, we reported two cases of intrathyroidal parathyroid adenomas. One of them was misinterpreted as thyroid lesions. The other was composed exclusively of oncocytic cells and had a correct cytological diagnosis. In this study, both cases showed a new cytological feature which has not been reported in the literature: many capillaries protruding outside the three-dimensional fragments without epithelial cells around. Diagn. Cytopathol. 2016;44:921-925. © 2016 Wiley Periodicals, Inc.
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Chang
authors.initials: C
authors.lastname: Shi
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Guan
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Qi
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Jialin
authors.initials: J
authors.lastname: Ji
authors.affiliation: Department of Ultrasound, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Jialing
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Yan
authors.affiliation: Department of Pathology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116011, People's Republic of China. yaya1167@163.com.
authors.forename: Huali
authors.initials: H
authors.lastname: Wang
mesh_terms: D000236:Adenoma / Q000473:pathology*; D044963:Biopsy, Fine-Needle; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008875:Middle Aged; D010282:Parathyroid Neoplasms / Q000473:pathology*; D016606:Thyroid Nodule / Q000473:pathology*
keywords: case report; diagnostic pitfall; fine-needle aspiration; intrathyroidal parathyroid adenoma