Interesting ImagesFDG PET/CT Findings of Ectopic Pituitary AdenomaIshizaki, Umiko MD*; Abe, Koichiro MD*; Takako, Kamio MD†; Masui, Kenta MD‡; Sakai, Shuji MD*Author Information From the Departments of *Diagnostic Imaging and Nuclear Medicine †Breast and Endocrine Surgery ‡Pathology 1, Tokyo Women's Medical University, Tokyo, Japan. Received for publication August 7, 2019; revision accepted October 7, 2019. Conflicts of interest and sources of funding: none declared. Correspondence to: Koichiro Abe, MD, Department of Diagnostic Imaging and Nuclear Medicine, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. E-mail: firstname.lastname@example.org. Online date: December 24, 2019 Clinical Nuclear Medicine: February 2020 - Volume 45 - Issue 2 - p 151-153 doi: 10.1097/RLU.0000000000002887 Buy Metrics Abstract A 72-year-old woman had undergone a right mastectomy for breast cancer 3 years earlier. PET/CT revealed a tumor with bony destruction of the skull base and FDG accumulation (SUVmax, 7.86). MRI showed the well-circumscribed tumor in the sphenoid sinus. The possibility of bone metastasis could not be denied. Tumor removal surgery was performed; the tumor was separate from the normal pituitary gland, and an ACTH-producing ectopic pituitary adenoma was diagnosed pathologically. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.