A 72-year-old man from Mumbai undergoes PSA screening and is found to have PSA 7.2 ng/mL. DRE reveals a hard, irregular nodule in the left lobe of the prostate. He is asymptomatic. What is the most appropriate next step in management?

Explanation

## Clinical Presentation This patient has: - Elevated PSA (7.2 ng/mL; normal <4) - Suspicious DRE findings (hard, irregular nodule) - These are red flags for prostate cancer. ## Diagnostic Algorithm **Key Point:** Any combination of elevated PSA AND abnormal DRE warrants tissue diagnosis via TRUS-guided biopsy. This is the gold standard for confirming prostate cancer. **High-Yield:** TRUS-guided biopsy is the standard approach because: 1. Real-time ultrasound visualization of the prostate 2. Systematic sampling (typically 12 cores) 3. High sensitivity (~90%) for detecting cancer 4. Relatively low morbidity (infection risk ~1–2%) ## Why TRUS-Guided Biopsy? ```mermaid flowchart TD A[PSA elevated + Abnormal DRE]:::outcome --> B{Proceed to biopsy?}:::decision B -->|Yes| C[TRUS-guided biopsy]:::action C --> D{Gleason score assigned}:::outcome D --> E[Risk stratification:<br/>Low/Intermediate/High]:::outcome E --> F[Staging + Treatment planning]:::action ``` ## Why Not Other Options? | Approach | Rationale for Rejection | |----------|------------------------| | **Repeat PSA in 3 months** | Delays diagnosis in a patient with suspicious DRE. Abnormal DRE alone (regardless of PSA) is sufficient indication for biopsy. | | **ADT without biopsy** | Treating without histological confirmation is inappropriate and exposes patient to ADT toxicity without proof of cancer. | | **MRI + watchful waiting** | MRI may be used for risk stratification AFTER biopsy, not as a substitute. Watchful waiting is inappropriate for suspected high-grade disease. | **Clinical Pearl:** In the presence of abnormal DRE, biopsy is indicated even if PSA is borderline (4–10 ng/mL). The combination of both abnormalities significantly raises cancer probability. **Mnemonic: TRUS Biopsy Indications — "HARD"** - **H**igh PSA (>4 ng/mL) - **A**bnormal DRE (hard, nodular, asymmetric) - **R**isk factors (age, family history, ethnicity) - **D**iagnosis required (tissue confirmation) [cite:Harrison 21e Ch 97; Robbins 10e Ch 20]