title: Thymoma mimicking thyroid papillary carcinoma: another pitfall in fine-needle aspiration.
abstract: Thymomas are composed of a mixture of epithelial and lymphoid cells. When the lymphoid cells predominate, the possibility of malignant lymphoma must be considered. Recently, a thymoma mimicking lymphoblastic lymphoma was reported in this journal as a diagnostic pitfall in a mediastinal aspiration. We encountered another diagnostic pitfall at the other end of the spectrum: a thymoma with a dominant epithelial component in which a papillary carcinoma of thyroid had to be considered in the differential diagnosis.
authors.affiliation: Department of Pathology, George Washington University, School of Medicine and Health Sciences, Washington, DC 20037, USA. yoli@gwis2.circ. gwu.edu
authors.forename: Y C
authors.initials: YC
authors.lastname: Oertel
mesh_terms: D000368:Aged; D001707:Biopsy, Needle; D002291:Carcinoma, Papillary / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D008223:Lymphoma / Q000473:pathology; D008297:Male; D008479:Mediastinal Neoplasms / Q000473:pathology; D013945:Thymoma / Q000473:pathology*; D013953:Thymus Neoplasms / Q000473:pathology*; D013964:Thyroid Neoplasms / Q000473:pathology*