title: Cervical thymic cyst presenting as a possible cystic nodal metastasis of papillary carcinoma in a 53-year-old man.
abstract: Cervical thymic cysts are rare embryonic remnants that develop along the course of thymic migration in the neck. They usually occur during infancy and childhood, and they are extremely rare in adults. We report a case of cervical thymic cyst in a 53-year-old man. The patient presented with a small mass of the thyroid gland and a cystic mass at the left level II area of the neck. On histopathology, the thyroid mass was identified as a papillary carcinoma and the left-sided neck mass was diagnosed as a cervical thymic cyst lined with nonkeratinizing, flattened squamous epithelium. The cyst wall contained atrophic thymic tissue composed of lymphoid cells, epithelial cords, and Hassall corpuscles. Although it is rare, cervical thymic cyst should be considered in the differential diagnosis of a lateral cystic neck mass in an adult.
authors.affiliation: Department of Pathology, Hanyang University College of Medicine, 17 Haengdang-Dong, Seongdong-Gu, Seoul 133-792, Korea.
authors.forename: Woong
authors.initials: W
authors.lastname: Na
authors.forename: Si-Hyong
authors.initials: SH
authors.lastname: Jang
authors.forename: Kyueng-Whan
authors.initials: KW
authors.lastname: Min
authors.forename: Seok Hyun
authors.initials: SH
authors.lastname: Cho
authors.forename: Seung Sam
authors.initials: SS
authors.lastname: Paik
mesh_terms: D002291:Carcinoma, Papillary / Q000175:diagnosis / Q000556:secondary*; D003560:Cysts / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013950:Thymus Gland / Q000000981:diagnostic imaging; D013953:Thymus Neoplasms / Q000175:diagnosis / Q000556:secondary*; D013964:Thyroid Neoplasms / Q000473:pathology*; D014463:Ultrasonography