Interesting ImagesA Case of Localized Malignant Peritoneal Mesothelioma With Lung Cancer Detected by 18F-FDG PET/CTKobayashi Shimizu, Shotaro MD∗; Okamura, Terue MD, PhD†; Koyama, Koichi MD, PhD†; Seura, Hirotaka MD†; Nishida, Norifumi MD, PhD∗Author Information From the ∗Department of Radiology †The PET Center, Saiseikai Nakatsu Hospital, Osaka, Japan. Received for publication February 5, 2020; revision accepted April 18, 2020. Conflicts of interest and sources of funding: none declared. Correspondence to: Shotaro Kobayashi Shimizu, MD, 2-10-39 Shibata, Kita-Ku, Osaka 530-0012, Japan. E-mail: email@example.com. Clinical Nuclear Medicine: October 2020 - Volume 45 - Issue 10 - p 795-797 doi: 10.1097/RLU.0000000000003129 Buy Metrics Abstract A 62-year-old woman was referred for cough and lower abdominal pain. 18F-FDG PET/CT showed strong uptake not only in the left lung mass and hilar and mediastinal lymph nodes, but also a huge lower abdominal mass. All lesions were initially thought to be multiple metastases because bronchial biopsy of the lung mass showed poorly differentiated adenocarcinoma. However, the abdominal mass was found to be malignant peritoneal mesothelioma after surgical resection. It was difficult to diagnose this case correctly before resection because localized malignant peritoneal mesothelioma is rare. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.