In BPH most common lobe involved is
**Core Concept**
The question is testing the understanding of the anatomical changes that occur in Benign Prostatic Hyperplasia (BPH). BPH is characterized by the non-malignant growth of the prostate gland, leading to an increase in its size.
**Why the Correct Answer is Right**
The most common lobe involved in BPH is the **Transition Zone (TZ)** of the prostate gland. The Transition Zone surrounds the proximal urethra and is composed of smooth muscle and glandular tissue. As men age, the cells in the Transition Zone undergo hyperplasia, leading to an increase in the size of this zone and subsequent obstruction of the urethra. This results in the classic symptoms of BPH, including urinary frequency, urgency, and difficulty starting urination.
**Why Each Wrong Option is Incorrect**
* **Option A:** **Peripheral Zone (PZ)** - While the Peripheral Zone is the most common site for prostate cancer, it is not the most common location for BPH.
* **Option B:** **Anterior Lobe** - The Anterior Lobe is a small part of the prostate gland that is not typically involved in BPH.
* **Option C:** **Posterior Lobe** - The Posterior Lobe is also not typically involved in BPH.
**Clinical Pearl / High-Yield Fact**
It's essential to differentiate between BPH and prostate cancer, as the treatment approaches are different. A digital rectal examination (DRE) can help identify the size and consistency of the prostate gland, but imaging studies like ultrasound and biopsy may be necessary to rule out cancer.
**Correct Answer: C. Posterior Lobe.**