Renal & Urology

Benign prostatic enlargement

Benign prostatic enlargement can narrow the bladder outlet and produce mixed lower urinary tract symptoms, but symptom severity, bladder function and complications—not prostate size alone—determine management.

Definition

Benign prostatic enlargement is non-malignant enlargement of the prostate that can contribute to bladder outlet obstruction and lower urinary tract symptoms. Histological benign prostatic hyperplasia and symptomatic bladder outlet obstruction are related but not synonymous.

First principles

The anatomy explains the obstructive symptoms

Benign prostatic hyperplasia is non-malignant proliferation, usually in the transitional zone around the urethra. Enlargement can create a static bulk component and a dynamic smooth-muscle component, so gland size and symptom severity do not always correlate. Symptoms are lower urinary tract symptoms from bladder outlet obstruction or bladder dysfunction, not proof that the prostate is the only cause.

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