Mastering Medical
USMLE Step 1 · Reproductive

BPH vs Prostate cancer and prostatitis

How to tell BPH and Prostate cancer and prostatitis apart when a board question makes them look alike.

Fastest separator

BPH is smooth transition-zone obstruction; cancer is hard peripheral-zone malignancy; prostatitis is painful inflamed prostate.

Side by side

BPHProstate cancer and prostatitis
Key clue

BPH causes lower urinary tract symptoms from periurethral transition-zone nodular hyperplasia with smooth enlarged prostate.

Prostate cancer often arises in peripheral zone as hard nodule; prostatitis causes pelvic pain, dysuria, fever or tender boggy prostate depending on type.

Mechanism

DHT-driven stromal and glandular hyperplasia compresses the urethra without malignant invasion.

Cancer involves malignant glandular proliferation; prostatitis involves inflammatory or infectious prostate disease.

Labs and tests

Smooth enlarged prostate, hesitancy, weak stream, nocturia, and transition-zone enlargement support BPH.

Hard irregular nodule, suspicious biopsy, or elevated PSA supports cancer; fever and tender boggy prostate support acute prostatitis.

The trap

Urinary symptoms and PSA can overlap, so exam texture, pain, fever, and biopsy context separate them.

Watch it explained

In the rapid reviewKidney Stones, Pyelonephritis & Bladder Cancer for USMLE Step 1 Made Easy
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The repair move

For prostate questions, separate obstructive smooth enlargement from hard malignancy and painful inflammation.

Try a free question

Core

A 68-year-old man has 2 years of progressive urinary frequency, urgency, nocturia (3 times nightly), weak stream, and incomplete emptying. Digital rectal exam reveals a smoothly enlarged, firm, non-tender prostate without nodules. PSA is 4.8 ng/mL. Which diagnosis is most likely?

Show answer and explanation

Answer: A. Benign prostatic hyperplasia. BPH is periurethral transition-zone nodular hyperplasia in older men with progressive obstructive lower urinary tract symptoms and smooth symmetric prostatic enlargement on DRE; treatment is alpha-blockers (tamsulosin) and 5-alpha-reductase inhibitors (finasteride).

Why the other choices are tempting

  • B. Prostate adenocarcinoma typically presents with a hard nodule in the peripheral zone on DRE, not smooth enlargement.
  • C. Acute bacterial prostatitis presents with fever, dysuria, and an exquisitely tender boggy prostate.
  • D. Chronic prostatitis has pelvic pain and dysuria without obstructive urinary symptoms or smooth enlargement.
  • E. Bladder neck contracture occurs after prior surgery and shows narrowing on cystoscopy rather than prostatic enlargement.

Flashcards

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What zone causes BPH symptoms?

Transition-zone periurethral growth causes BPH symptoms.

What zone commonly gives prostate cancer?

The peripheral zone commonly gives prostate cancer.

Quick answers

What is the fastest way to tell BPH from Prostate cancer and prostatitis?

BPH is smooth transition-zone obstruction; cancer is hard peripheral-zone malignancy; prostatitis is painful inflamed prostate.

What is the key clue for BPH?

BPH causes lower urinary tract symptoms from periurethral transition-zone nodular hyperplasia with smooth enlarged prostate.

What is the key clue for Prostate cancer and prostatitis?

Prostate cancer often arises in peripheral zone as hard nodule; prostatitis causes pelvic pain, dysuria, fever or tender boggy prostate depending on type.

What is the common trap with BPH vs Prostate cancer and prostatitis?

Urinary symptoms and PSA can overlap, so exam texture, pain, fever, and biopsy context separate them.