Benign prostatic hypertrophy or hyperplasia. Increase in prostate volume that is generally observed after the age of 50, with an unknown etiology, but dependent on the action of androgens. It can cause urinary obstruction symptoms. Diagnosis is based on exploration, transrectal ultrasound and PSA dosage. Therapy is based on the use of alpha-blockers and antiandrogens or on surgical resection, usually transrectally (TURP). Today also with minimally invasive techniques such as the greenlight.