PT  - JOURNAL ARTICLE
AU  - Guohua Shen
AU  - Wenjie Zhang
AU  - Zhiyun Jia
AU  - Houfu Deng
TI  - Interesting Layering of Excreted <sup>18</sup>F-FDG in the Urinary Bladder in Patients with Urinary Tract Infection and Distended Bladder
AID  - 10.2967/jnmt.114.148031
DP  - 2015 Sep 01
TA  - Journal of Nuclear Medicine Technology
PG  - 234--235
VI  - 43
IP  - 3
4099  - http://tech.snmjournals.org/content/43/3/234.short
4100  - http://tech.snmjournals.org/content/43/3/234.full
SO  - J. Nucl. Med. Technol.2015 Sep 01; 43
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.