1. What is Bladder outlet obstruction?
Bladder outlet obstruction Bladder outlet obstruction (BOO) is a blockage at the base of the bladder that reduces or prevents the flow of urine into the urethra, the tube that carries urine out of the body.
http://www.medhelp.org/medical-information/show/692/bladder-outlet-obstruction

2. Bladder outlet obstruction
Bladder outlet obstruction occurs at the base of the bladder, and reduces or prevents the flow of urine into the urethra (the tube that carries urine out of...
http://shands.org/health/information/002238.htm

3. Bladder outlet obstruction -- Baylor Health Care System
Bladder outlet obstruction (BOO) is a blockage at the base of the bladder that reduces or prevents the flow of urine into the urethra, the tube that carries...
http://www.baylorhealth.com/healthinformation/1/002238.htm