title: Pulmonary carcinoid tumor masquerading as a synovial sarcoma.
abstract: A rare case of pulmonary carcinoid tumor exhibiting morphologically as a monophasic synovial sarcoma is reported. The patient is a 37-year-old man who presented with shortness of breath for several weeks. The chest computed tomographic scan showed a 3.5 cm pulmonary mass in the left lower lobe.The lesion was an oval, tan nodule displaying features of monophasic synovial sarcoma. Immunohistochemical studies were performed and included a carcinoid tumor as a main differential diagnosis. Reverse transcriptase polymerase chain reaction and fluorescence in situ hybridization studies were negative for a molecular evidence of synovial sarcoma. This case further emphasizes the capacity of pulmonary carcinoid tumor cells to show various morphologic expressions even toward a mesenchymal differentiation mimicking a synovial sarcoma.
authors.affiliation: Department of Pathology, South Nassau Communities Hospital, One Healthy Way, Oceanside, New York, USA. yzhong96@yahoo.com
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhong
authors.forename: Susan
authors.initials: S
authors.lastname: Wu
authors.forename: Shahriyour
authors.initials: S
authors.lastname: Andaz
authors.forename: Svetlana
authors.initials: S
authors.lastname: Danovich
authors.forename: Jen
authors.initials: J
authors.lastname: Lin
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism; D002276:Carcinoid Tumor / Q000378:metabolism / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000378:metabolism / Q000473:pathology*; D008297:Male; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013584:Sarcoma, Synovial / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor