Intramural fat of the urinary bladder

Last revised by Rohit Sharma on 3 Feb 2024

Intramural fat of the urinary bladder is an occasional benign finding on CT/MRI. 

The incidence of this finding in histopathological studies is up to 4%. There is a male predominance 4.

It is typically an incidental, asymptomatic finding.

Adipocytes are found both within the lamina propria and the muscularis propria components of the wall of the urinary bladder 3.

On CT, a thin fat density stripe is visible along the bladder wall, primarily at the dome and anteriorly. It is more commonly seen when the bladder is only partially filled with urine 2.

It should not be confused with emphysematous cystitis, in which bubbles of gas are present within the wall. No lipid-fluid level is visible within the bladder proper (cf. chyluria).

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