A 53-year-old man with a 10-year history of gout was admitted to our hospital due to chronic low back pain. Initial CT examinations showed a high-density mass with bone destruction of bilateral facet joints at the L3 to L5 level. MRI findings also revealed lesion with the dural sac compression. On PET/CT, the juxta-articular mass of bilateral L3 to L5 facet joints showed abnormal FDG uptake with an SUVmax of 4.2. The possible diagnosis may be gouty tophi; however, the biopsy revealed the diagnosis of calcium pyrophosphate dihydrate deposition disease, also referred to as pseudogout.
From the Department of Nuclear Medicine, West China Hospital of Sichuan University, Chengdu, Sichuan, China.
Received for publication August 8, 2018; revision accepted August 29, 2018.
Conflicts of interest and sources of funding: This study was supported by National Natural Science Foundation of China (grant no. 81471692). None declared to all authors.
Correspondence to: Anren Kuang, MD, Department of Nuclear Medicine, West China Hospital of Sichuan University, No. 37 Guoxue Alley, Chengdu 610041, China. E-mail: firstname.lastname@example.org.