Adenocarcinoma of the thymus: mucinous subtype.
Primary thymic adenocarcinoma, mucinous subtype, is extremely rare with only one case reported to date. We describe herein a case of thymic mucinous adenocarcinoma. A 59-year-old man was identified to have an anterior mediastinal tumor and was diagnosed as mucinous adenocarcinoma. Clinical and radiographic examinations disclosed no evidence of tumor elsewhere. The patient received radiotherapy, but the general condition deteriorated and died 11 months after tumor detection. Thoracic autopsy revealed an anterior mediastinal tumor measuring greater than 10 cm, uncapsulated, and white. The tumor had clear margins and was clearly isolated from the lung. Histologically, the tumor demonstrated papillary, acinar, and cribriform structure and produced abundant extracellular mucin. Immunohistochemically, most tumor cells were positive for cytokeratin 7, were partially positive for CD5, and were negative for TTF-1, Sp-A, CDX-2, MUC2, napsin A, and cytokeratin 20. Collectively, the diagnosis of the tumor was primary mucinous adenocarcinoma of the thymus. We propose that the mucinous subtype should be recognized as one of the histopathological entities of thymic adenocarcinoma.
Takahashi
Fumiyuki
F
Department of Respiratory Medicine, Juntendo University, School of Medicine, Tokyo 113-8421, Japan. fumiyuki@med.juntendo.ac.jp
Tsuta
Koji
K
Matsuno
Yoshihiro
Y
Takahashi
Kazuhisa
K
Toba
Michie
M
Sato
Koichi
K
Uekusa
Toshimasa
T
Izumi
Hiroshi
H
Nakamura
Kazuhiro
K
Hirose
Sachiko
S
Fukuchi
Yoshinosuke
Y
D002288:Adenocarcinoma, Mucinous / Q000737:chemistry / Q000473:pathology* / Q000532:radiotherapy; D014408:Biomarkers, Tumor / Q000032:analysis; D017809:Fatal Outcome; D006801:Humans; D007150:Immunohistochemistry; D053552:Keratin-7; D007633:Keratins / Q000032:analysis; D008297:Male; D008479:Mediastinal Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000532:radiotherapy; D008875:Middle Aged; D013953:Thymus Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000532:radiotherapy
D014408:Biomarkers, Tumor; C507497:KRT7 protein, human; D053552:Keratin-7; D007633:Keratins