## Diagnosis: Benign Prostatic Hyperplasia (BPH) ### Clinical Presentation The patient presents with classic lower urinary tract symptoms (LUTS) of BPH: - Nocturia (most common early symptom) - Weak stream (obstruction) - Incomplete emptying (residual urine) - Progressive course over months ### Key Pathological Features **Key Point:** BPH is characterized by nodular hyperplasia of both stromal (smooth muscle) and epithelial (glandular) components of the prostate. ### Distinguishing Features in This Case | Feature | BPH | Adenocarcinoma | Prostatitis | |---------|-----|-----------------|-------------| | DRE findings | Smooth, firm, uniform enlargement | Hard, nodular, asymmetric | Tender, boggy | | PSA level | Normal to mildly elevated | Often >10 ng/mL | Elevated acutely | | Symptom onset | Gradual (months to years) | Often insidious | Acute/subacute | | Systemic symptoms | None | Weight loss, fatigue | Fever, dysuria, pain | | Ultrasound | Diffuse enlargement | Hypoechoic nodules | Heterogeneous | **High-Yield:** BPH is the most common benign tumor in men, affecting >90% by age 80. It is NOT premalignant. ### Pathogenesis 1. Age-related increase in DHT (dihydrotestosterone) sensitivity 2. Stromal-epithelial interactions 3. Nodular hyperplasia of transition zone (periurethral glands) 4. Mechanical obstruction of urethra **Clinical Pearl:** The transition zone (where BPH originates) comprises only 5% of normal prostate volume but accounts for >95% of BPH mass. Peripheral zone tumors (adenocarcinoma) are often clinically silent until advanced. ### Histopathology of BPH - Nodular proliferation of smooth muscle and glandular epithelium - Intact basement membrane - No cytologic atypia - Variable stromal:epithelial ratio **Mnemonic:** **SMOOTH** = Stromal and epithelial hyperplasia, Maintains normal architecture, Obstructive symptoms, Older men, Transition zone origin, Hyperplasia (NOT neoplasia), DHT-dependent.
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