68 Ga-DOTATATE and 68 Ga-Pentixafor PET/CT in a Patient with Castleman Disease of the Retroperitoneum.

This is a case of a 42-year-old man with recurrent symptoms of dizziness and a newly found retroperitoneal mass with no 131 I-MIBG uptake who was referred for restaging with 68 Ga-DOTATATE PET/CT and local 68 Ga-pentixafor PET/CT. The examinations both showed intense radioactivity uptake in the retroperitoneal mass and no abnormal uptake in the right adrenal nodule. Two lesions showed distinct properties of radioactivity uptake, which suggested the possibility of different sources. A postoperative pathological test revealed that the morphology and immunohistochemistry of the retroperitoneal mass was found to be consistent with Castleman disease, and the right adrenal gland was normal tissue.