Interesting Layering of Excreted 18F-FDG in the Urinary Bladder in Patients with Urinary Tract Infection and Distended Bladder

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FIGURE 1.
CT (top), PET (middle), and PET/CT (bottom) images showing layering of ¹⁸F-FDG in bladder. (A) A 63-y-old woman with T1 pathologic fracture and urinary tract infection. (B) A 67-y-old man with widespread bone and lymph node metastases from unknown primary tumor, also with urinary tract infection.

TABLE 1

Clinical and Pathologic Details of the 2 Patients

Age (y)	Sex	Diagnosis	Urine examination	UTI	HIV	Other infection site	On antibiotics
63	F	T1 pathologic fracture + UTI	Turbid/cloudy, protein > 300 mg/dL, specific gravity < 1.01, WBC/HP > 5, RBC/HP > 3, bacteria/μL > 230	+	−	−	+
67	M	Widespread bone and lymph node metastases from unknown primary tumor + UTI	Turbid/cloudy, WBC/HP > 5, RBC/HP > 3, bacteria/μL > 230	+	−	Lung	+

UTI = urinary tract infection; + = present; − = absent; WBC = white blood cell; HP = high-power field; RBC = red blood cell;