Follicular dendritic cell tumor as an unknown primary tumor

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• 作者：Yoshihiro Yakushijin ; Hisaharu Shikata ; Katsumi Kito ; Kohichi Ohshima ; Kensuke Kojima ; Takaaki Hato ; Hitoshi Hasegawa and Masaki Yasukawa
• 关键词：Unknown primary tumor ; Primary lymph node neoplasm ; Follicular dendritic cell tumor
• 刊名：International Journal of Clinical Oncology
• 出版年：2007
• 出版时间：February, 2007
• 年：2007
• 卷：12
• 期：1
• 页码：56-58
• 全文大小：306 KB

文摘

A 70-year-old Japanese man presented to our hospital with a 1-month history of progressive general fatigue and anorexia. A physical examination revealed severe anemic condition, mild persistent splenomegaly, and no palpable surface lymph nodes. He had pleural effusion and ascites, though no malignant cells were detected in the effusion. He eventually died without any diagnosis of his disease. Immunohistochemical staining of his tumor after autopsy showed atypical cells that were negative for epithelial membrane antigen (EMA), keratin (AE1/3), keratin-20, vimentin, factor VIII, leukocyte common antigen (LCA/T200; CD45), myeloperoxidase (MPO), terminal deoxynucleotidyl tranferase (TdT), lysozyme, CD1a, CD3, CD4, CD10, CD15, CD20 (L26), CD21, CD23, CD34, CD43, CD56, CD68, CD79a, CD138, and EBER-1 in situ. Only a few scattered cells expressed CD30, but they showed no staining for anaplastic large-cell lymphoma kinase (ALK). A few scattered cells expressed S-100 antigen and the majority of cells dominantly expressed dendritic cell-associated antigens (CD35, FDC, Ki-M1p). In conclusion, we found this unknown primary tumor to be consistent with a follicular dendritic cell tumor with anaplastic features.