A 56-year-old woman with breast cancer underwent FDG PET/CT at follow-up. The PET images showed increased FDG uptake along right sacroiliac joint. The coregistered CT images showed diffuse sclerosis around the sacroiliac joints, but no bony destruction, periarticular erosion, or joint space narrowing. She had been complaining of intermittent lower back pain since her last pregnancy. The radiologic pictures and history of postpartum back pain were considered as typical characteristics for osteitis condensans ilii. This case reminds us that careful inspection of the coregistered CT images is important to avoid potential misinterpretation because of osteitis condensans ilii.
From the *Department of Hemato-oncology, Tainan Municipal Hospital, Tainan, Taiwan; Departments of †Radiology and ‡Nuclear Medicine, Chang Bing Show Chwan Memorial Hospital, Changhua, Taiwan; and §Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, Taiwan.
Received for publication December 13, 2009; revision accepted January 21, 2012.
Conflicts of interest and sources of funding: none declared.
Reprints: Guang-Uei Hung, MD, Department of Nuclear Medicine, Chang Bing Show Chwan Memorial Hospital, 6 Lukon Road, Lukong Town, Changhua Shien, Taiwan 505, Taiwan. Email: email@example.com.