TY - JOUR T1 - Interesting Layering of Excreted <sup>18</sup>F-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. SP - 234 LP - 235 DO - 10.2967/jnmt.114.148031 VL - 43 IS - 3 AU - Guohua Shen AU - Wenjie Zhang AU - Zhiyun Jia AU - Houfu Deng Y1 - 2015/09/01 UR - http://tech.snmjournals.org/content/43/3/234.abstract N2 - 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. ER -