Final answer:
Benign prostatic hypertrophy involves the middle portion of the prostate gland and causes lower urinary tract symptoms. Medication and surgery are common treatments for BPH.
Step-by-step explanation:
The portion of the prostate gland involved in benign prostatic hypertrophy (BPH) is the middle portion of the gland. BPH occurs when the prostate gland enlarges and constricts the urethra, leading to lower urinary tract symptoms. It is important to note that BPH is different from prostate cancer. Mild to moderate BPH symptoms can be managed with medication, while severe cases may require surgical removal of a portion of the prostate gland.