DDX of bladder outlet obstruction

Approach to the DDX of bladder outlet obstruction:

  • Cross sectional imaging can be extremely helpful in determining the level of the bladder outlet obstruction and thus its etiology:
    — Bladder due to rhabdomyosarcoma
    — Prostate due to rhabdomyosarcoma
    — Vagina due to rhabdomyosarcoma
    — Posterior urethra due to posterior urethral valves
    — Presacral mass due to sacrococcygeal teratoma or constipation