两年前，一名64岁男性接受了18F-FDG PET/CT检查用于分期直肠癌。除了高代谢的直肠病灶外，影像显示还存在一颗亮度高且活动度强的肠系膜淋巴结以及几个肺结节，FDG摄取轻微，高度怀疑存在转移。手术及多个周期的化疗后，随访18F-FDG PET/CT显示除了代谢活性更高的肠系膜淋巴结外，所有病灶均已缓解。随访期间CEA血清水平保持正常。手术后肠系膜淋巴结病理检查证实为Castleman病。版权所有©2023 Wolters Kluwer Health, Inc. 保留所有权利。

Two years ago, a 64-year-old man underwent an 18F-FDG PET/CT for staging rectal cancer. Besides the hypermetabolic rectal lesion, the image revealed a mesenteric lymph node with intense activity and multiple lung nodules with slight FDG uptake, which were highly suspected of metastases. After surgery and multiple cycles of chemotherapy, the follow-up 18F-FDG PET/CT showed remission of all lesions except for the enlarged mesenteric lymph node with higher metabolic activity. Serum CEA remained normal during the follow-up. Postoperative pathology of the mesenteric lymph node confirmed Castleman disease.Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.