Enlarged Prostate on Ultrasound: What Does It Mean?

An enlarged prostate on ultrasound means the scan measured or described the prostate gland as larger than expected. In most men this reflects benign prostatic hyperplasia (BPH), a non-cancerous growth of the gland that becomes more common with age. The finding alone does not show cancer, and it does not tell you how much the prostate is affecting your bladder.

This guide is for adults who have a scan report mentioning an enlarged or bulky prostate, or a prostate volume figure. It explains the wording and the questions worth asking. It cannot interpret your own report or decide whether you need treatment.

Cleveland Clinic describes acute urinary retention as an emergency. If you suddenly cannot pass urine at all, or can pass only small amounts while your bladder feels full and painful, seek urgent medical help through local emergency services. Do not wait for a routine appointment.

NIDDK and MedlinePlus also advise contacting a health professional promptly for the following.

• Being unable to urinate at all, or passing much less urine than usual.
• Painful, frequent or urgent urination with fever or chills.
• Blood or pus in the urine.
• Severe pain or discomfort in the lower abdomen, back or side.

Often, but not always in the report's wording. BPH is the medical name for non-cancerous prostate enlargement. NIDDK calls it the most common prostate problem in men over 50. A radiologist may write 'enlarged', 'bulky' or 'prostatomegaly' and give a volume. Your clinician combines that description with your symptoms and examination before using the BPH label.

The NHS states that an enlarged prostate is not caused by prostate cancer and does not raise the risk of getting it. However, prostate cancer can sometimes cause similar urinary symptoms, which is one reason symptoms should still be checked rather than explained away by the scan.

A prostate scan can estimate the size of the gland, and RadiologyInfo notes that measurements may be taken to help plan treatment. Reports usually give an estimated volume. A normal prostate is often described as roughly the size of a walnut, but exact cut-offs vary, and this guide does not give one. Ask the clinician what the figure means for you rather than comparing it with numbers online.

How the scan was done also matters. A dedicated transrectal ultrasound uses a small probe in the rectum and gives detailed prostate images; it can also guide a biopsy. Other reports mention the prostate as part of a bladder or pelvic scan, which may give a rougher estimate. Check the examination name on your report.

Not necessarily. NIDDK states that symptoms or difficulty urinating may not be directly related to prostate size. A very large gland can cause few problems, while a slightly enlarged one can cause many. For this reason, a volume figure on its own rarely decides the next step.

Typical symptoms listed by the NHS include trouble starting to pee, a weak or stop-start flow, dribbling afterwards, a feeling that the bladder has not fully emptied and needing to go more often or urgently, including at night. Noting which symptoms you have, and how much they disrupt daily life, gives the clinician information the scan cannot provide. The NHS also describes a bladder diary, recording drinks and urination over at least three days.

Post-void residual (PVR) is the amount of urine left in the bladder after you pass urine. It is often measured with a quick ultrasound bladder scan on the abdomen, or sometimes with a catheter. A high residual can point to urinary retention, and an enlarged prostate is one common cause.

Cleveland Clinic gives a normal post-void residual of between 50 mL and 100 mL, but also notes that your provider may judge different volumes as high for you. Units and thresholds vary between services, so ask how your result was interpreted. Your report may also mention the bladder wall. A thickened-looking bladder wall can relate to blockage, infection or simply an underfilled bladder; see our guide on bladder wall thickening.

PSA is a blood test that is sometimes done alongside or before a prostate scan. MedlinePlus lists an enlarged prostate (BPH), prostatitis and urinary infections among non-cancer causes of a raised PSA, and states that there is no specific normal or abnormal PSA level. A PSA test cannot show the cause of a result by itself, and PSA can go up and down, so clinicians often look at results over time.

If your PSA was raised as well, the scan finding does not settle the question either way. Ask how the PSA, the prostate size and any examination findings were considered together. Our guide on a first raised PSA result covers that conversation in more detail.

Bring the full written scan report and any PSA or urine results. These questions can help turn a single phrase on a report into a clear plan.

• What type of ultrasound was this, and how reliable is the volume estimate from it?
• Does my prostate size explain my symptoms, or could something else be contributing?
• Was my post-void residual measured, and was it within the range you would expect for me?
• Did the scan show anything about my bladder or kidneys that needs follow-up?
• How do my PSA result and examination fit with this scan?
• Would a urine flow test, bladder diary or other test add useful information?
• Which symptoms should make me seek urgent care, and who do I contact?

On SameCase, patients and verified doctors share de-identified cases. Reading how other people with an enlarged prostate described their scan wording, residual volumes and symptoms can help you notice what to ask about your own results. Doctors' comments on similar cases may highlight questions you had not considered.

Other people's cases are not your case. They cannot tell you what your scan means or which treatment suits you. Use them to prepare questions, then discuss your own results with the clinician who knows your history.