PSA and MRI guided biopsy of prostate

Adult and Pediatric Urology Blog PSA and MRI guided biopsy of prostate

PSA (Prostate-Specific Antigen) PSA is a protein produced by prostate tissue.

Elevated levels can occur with: Prostate cancer Benign prostatic hyperplasia (BPH) Prostatitis or infection

Recent ejaculation, catheterization, or instrumentation PSA is not cancer-specific, so abnormal values require risk stratification rather than automatic biopsy.

Factors that influence decision-making: Absolute PSA value PSA density (PSA ÷ prostate volume from MRI) PSA velocity (rate of rise over time) Age and life expectancy Family history and genetics (e.g., BRCA mutations)

Prior biopsy history Prostate MRI (Multiparametric MRI) Multiparametric MRI (mpMRI) evaluates prostate anatomy and suspicious lesions before biopsy.

Lesions are graded using the PI-RADS scoring system (1–5): PI-RADS 1–2 → low suspicion PI-RADS 3 → equivocal PI-RADS 4–5 → high suspicion for clinically significant cancer MRI helps: Detect clinically significant tumors

Avoid unnecessary biopsy in some men with negative imaging Guide targeted biopsy Improve detection of aggressive cancers

Reduce overdiagnosis of low-risk disease MRI-Guided Prostate Biopsy There are three main approaches: MRI-Ultrasound Fusion Biopsy (most common) MRI images are fused with real-time ultrasound to target lesions.

In-bore MRI biopsy Performed directly inside the MRI scanner (less common, more resource-intensive).

Cognitive targeting Operator uses MRI knowledge to guide ultrasound biopsy without software fusion.

Biopsies can be performed via: Transrectal approach (traditional) Transperineal approach (increasingly favored due to lower infection risk)

Targeted cores are usually combined with systematic sampling for best detection.

Why MRI Before Biopsy Matters Compared with random biopsy alone: Higher detection of clinically significant cancer Fewer unnecessary biopsies Fewer low-grade cancer diagnoses Better risk stratification

Large trials such as PRECISION trial demonstrated improved detection of significant cancer with MRI-targeted biopsy.

When MRI-Guided Biopsy Is Recommended Common indications: Elevated PSA or abnormal PSA kinetics Abnormal digital rectal exam

Prior negative biopsy with persistent suspicion Active surveillance monitoring Pre-treatment planning

Risks of Biopsy Infection (lower with transperineal) Hematuria, hematospermia Urinary retention Bleeding Discomfort Serious complications are uncommon.

Clinical Perspective Many guidelines (e.g., American Urological Association and European Association of Urology) now support MRI prior to initial biopsy when available.

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