Case 36 Answer: Uretheral DiverticulumLook for the horse-shoe shaped cystic structure surrounding the urethra near the base of the bladder. ...

Case 36 Answer: Uretheral Diverticulum

Look for the horse-shoe shaped cystic structure surrounding the urethra near the base of the bladder.  There is some stranding so maybe infected?

short ref: https://radiopaedia.org/articles/urethral-diverticulum

long ref: https://pubs.rsna.org/doi/pdf/10.1148/rg.287075076