title: Ectopic thymoma presenting as a giant intrathoracic tumor: a case report.
abstract: Ectopic thymoma rarely presents as an intrathoracic tumor. We report a case of ectopic thymoma presenting as a giant right intrathoracic tumor that was treated with resection. The patient was a 50-year-old Japanese woman who presented with the chief complaint of chest pain. Detailed examination revealed a solid tumor measuring 15 × 10 × 8 cm in diameter, with a clear border. The Imaging findings suggested a solitary fibrous tumor, and surgery was performed. At surgery, the tumor was found to be adherent to the diaphragm, mediastinal pleura, and lower lobe of the lung, although it could be dissected with relative ease and was removed. Pathological diagnosis indicated a type B1 tumor with no capsular invasion according to the World Health Organization classification, and a diagnosis of Masaoka stage I thymoma was made. No continuity with the normal thymus tissue was seen, and the thymoma was considered to be derived from ectopic thymic tissue in the pleura.
authors.affiliation: Department of Surgery, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1-1, Asahikawa, Hokkaido 078-8510, Japan. k1111@asahikawa-med.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kitada
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Sato
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Satoshi
authors.initials: S
authors.lastname: Hayashi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Tokusashi
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Miyokawa
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Sasajima
mesh_terms: D002828:Choristoma / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008206:Lymphatic Diseases / Q000175:diagnosis* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010994:Pleura; D010997:Pleural Neoplasms / Q000175:diagnosis*; D013902:Radiography, Thoracic; D020775:Thoracic Surgery, Video-Assisted / Q000379:methods; D014057:Tomography, X-Ray Computed