RT Journal Article SR Electronic T1 Interesting Layering of Excreted 18F-FDG in the Urinary Bladder in Patients with Urinary Tract Infection and Distended Bladder JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 234 OP 235 DO 10.2967/jnmt.114.148031 VO 43 IS 3 A1 Guohua Shen A1 Wenjie Zhang A1 Zhiyun Jia A1 Houfu Deng YR 2015 UL http://tech.snmjournals.org/content/43/3/234.abstract AB Settling of 18F-FDG in the bladder is often noted on whole-body PET/CT images, but this phenomenon has never received any careful attention and the mechanism has been unclear. The 2 patients described in this report, one with a T1 pathologic fracture and another with widespread bone and lymph node metastases from an unknown primary tumor, underwent PET/CT. Both had urinary tract infection and a distended bladder during scanning. The interesting layering of 18F-FDG in the urinary bladder was observed in both patients. The presence of this phenomenon demands careful evaluation of the urine by the clinician, and the mechanism is hypothesized to be slow 18F-FDG excretion in patients with a distended urinary bladder, resulting in delayed mixing with urine. In addition, urinary tract infection may be a potential cause. Images showing this interesting layering should be interpreted with care.