## Analysis of BPH Features ### Correct Statements (Options 0, 1, 2) **Key Point:** BPH is a common benign condition in aging men with well-established pathophysiology and histology. | Feature | Detail | |---------|--------| | **Origin** | Arises exclusively from the transition zone (periurethral glands) surrounding the urethra | | **Hormonal driver** | DHT (not testosterone) is the key androgen; 5-alpha reductase converts testosterone to DHT | | **Histology** | Nodular hyperplasia with both stromal (smooth muscle, fibroblasts) and glandular components; cystic dilation common | | **Symptoms** | LUTS: frequency, urgency, nocturia, weak stream, hesitancy, incomplete emptying | ### Why Option 3 Is Incorrect **High-Yield:** BPH does NOT compress the urethra by external pressure from within the capsule. Instead, the hyperplastic transition zone *surrounds* the urethra and compresses it *from within* the gland itself (intraurethral obstruction). The obstruction is **intrinsic to the gland**, not extrinsic compression. The prostatic capsule is intact and does not play a primary role in obstruction. **Clinical Pearl:** This distinction is crucial for understanding why alpha-blockers (which relax smooth muscle in the transition zone) are effective, and why the obstruction is dynamic rather than purely mechanical. ### Pathophysiology Summary ```mermaid flowchart TD A[Aging + DHT]:::outcome --> B[Transition zone hyperplasia]:::outcome B --> C[Intraurethral compression]:::action C --> D[Increased urethral resistance]:::outcome D --> E[LUTS: frequency, nocturia, weak stream]:::outcome F[Alpha-blockers relax smooth muscle] -.-> C F -.->|Symptom relief| G[Improved flow]:::action ``` **Mnemonic:** **DHTZ** — **D**ihydrotestosterone drives **H**yperplasia in **T**ransition **Z**one.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.