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Prostate biopsy

MRI-Ultrasound Fusion — Prostate Biopsy

If your doctor has mentioned a fusion biopsy, you may be wondering what an MRI scan has to do with a needle test. The two work together: the MRI is done first to find where to look, and the fusion software guides the needle to those specific spots on the day of the procedure.

Medically reviewed by Dr. Mohammed Imaduddin, Surgical Oncologist, MBBS · MS (General Surgery) · M.Ch (Surgical Oncology) · Last reviewed September 2026

  • MRI done before the procedure — You have a prostate MRI first. Those images are stored and then loaded into software on the day of the biopsy.
  • Two images, one view — The stored MRI is overlaid onto a live ultrasound picture so the urologist can see the suspicious area while placing the needle.
  • Targeted and systematic sampling — Cores are taken from areas the MRI flagged, and from the wider gland. Both are needed to reduce the chance of missing a cancer.
  • Day procedure — Fusion biopsy is done as a day procedure under local anaesthetic at most centres. You usually go home the same day.
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MRI-ultrasound fusion biopsy overlays stored MRI images onto a live ultrasound picture of the prostate, so the biopsy needle goes to areas flagged as suspicious rather than random spots. It is intended to find clinically significant cancers that a standard random biopsy can miss. Fusion platforms are available at specialist urology and oncology centres in India.

What happens during a fusion biopsy, step by step?

  1. Prostate MRI

    You have a multiparametric MRI of the prostate before the biopsy day. This uses a magnetic field, not ionising radiation. The scan takes around 45 minutes and does not involve any needles.

  2. Radiologist review

    A radiologist examines the MRI images and marks any areas that look abnormal, scoring each one using a standard scale called PI-RADS.

  3. Images are transferred

    On the day of the biopsy, the stored MRI images are loaded into the fusion software at the procedure suite.

  4. Software alignment

    The platform overlays the MRI map onto the live ultrasound picture as the probe moves. Both images are visible to the urologist at the same time.

  5. Targeted sampling

    The urologist guides the needle to each area flagged on the MRI and takes biopsy cores from those specific spots.

  6. Systematic sampling

    Additional cores are taken from the rest of the gland. This reduces the chance of missing a cancer the MRI did not show.

  7. Pathology

    The labelled samples are sent to a laboratory. Your urologist will go through the results with you at a follow-up appointment.

What do the terms mean?

mpMRI
Multiparametric MRI — the type of prostate MRI done before fusion biopsy. It combines several imaging sequences to highlight areas where tissue looks abnormal.
PI-RADS
The radiologist's score for each area on the MRI, from 1 (very unlikely to be significant) to 5 (highly suspicious). It guides which areas are targeted.
Fusion
The software step that overlays the stored MRI map onto the live ultrasound image so both are aligned and move together as the probe moves.
Targeted cores
Biopsy samples taken from areas the MRI scored as suspicious.
Systematic cores
Additional samples from the wider gland, taken alongside targeted cores to reduce the chance of missing a cancer the MRI did not show.
TRUS
Transrectal ultrasound — the probe placed in the rectum during the procedure that provides the real-time image the fusion software aligns with the MRI.

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Does fusion biopsy find cancers that a standard biopsy misses?

Standard prostate biopsy samples from fixed positions across the gland, without knowing where a cancer sits. If the cancer is between two sampling positions, it can be missed entirely.

MRI-targeted biopsy is intended to reduce that gap. ESMO and NCCN guidance recognises that MRI-targeted cores detect a higher proportion of clinically significant prostate cancers than systematic sampling alone — meaning cancers most likely to need treatment, not low-grade changes that may never cause harm.

Fusion reduces — but does not eliminate — the risk of missing a significant cancer. Systematic cores are still taken alongside the targeted ones for this reason.

Is fusion biopsy available in Hyderabad and across India?

Fusion biopsy platforms are available at a growing number of specialist urology and oncology centres in India, including Hyderabad.

The technique requires both a validated MRI-to-ultrasound fusion platform and a radiologist-urologist team trained to use it together. It is worth asking whether the radiology centre reading your MRI uses a format compatible with the fusion platform at the biopsy centre.

CION coordinates diagnostic imaging and biopsy planning across its 35-plus centres in Telangana and Andhra Pradesh. Your urologist can explain which pathway applies at your nearest centre.

Did you know?

Major international guidelines now recommend that a prostate MRI be done before a first biopsy in men investigated for prostate cancer — rather than proceeding straight to systematic random sampling.

The aim is to identify who benefits from a targeted approach, and to help avoid biopsy altogether in men whose MRI shows no suspicious area.

Source: ESMO Clinical Practice Guidelines: Prostate Cancer

Explore 62 more Biopsy Techniques and How They Compare topics

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Common questions

Frequently asked questions

What is the difference between fusion biopsy and standard prostate biopsy?

A standard biopsy samples from fixed positions across the gland using ultrasound alone — the urologist cannot see where a cancer might be and samples widely. Fusion biopsy adds an MRI map overlaid on the live ultrasound, so the needle goes to areas the MRI flagged as suspicious. Both approaches also include systematic cores from the wider gland. The key difference is that fusion gives the urologist a specific target rather than sampling blind.

Will I be awake during the procedure?

Most fusion biopsies are done under local anaesthetic. You will be awake and aware of pressure but should not feel sharp pain once the anaesthetic takes effect. Some centres offer sedation for patients who would prefer it — ask your urologist what is available at your centre. Once everything is set up, the procedure itself usually takes under 30 minutes.

Is the procedure painful?

Most men describe pressure and discomfort rather than sharp pain once the local anaesthetic is working. There is a brief sting when the anaesthetic is injected near the prostate. Some short sharp sensations when cores are taken are normal. Blood in the urine or stool for a few days afterwards is expected. Contact your team if you have significant pain, a fever, or difficulty passing urine.

What happens if the MRI shows nothing suspicious?

A normal or low-risk MRI is useful information in itself. If no area meets the threshold for targeting, your urologist may recommend monitoring your PSA rather than proceeding to biopsy — which helps some men avoid an unnecessary procedure. If your PSA continues to rise, biopsy can be reconsidered. Your urologist will explain what the result means for your specific situation.

How long do biopsy results take?

Pathology results typically take one to two weeks. Each core is processed and examined by a pathologist, who reports whether cancer was found, what grade it is, and how many cores were involved. Go through the report with your urologist rather than reading it alone — the terminology is technical, and the significance depends on your full clinical picture.

How do I know if fusion biopsy is the right option for me?

Your urologist will consider your PSA level and trend, your prostate volume, any previous biopsy results, and whether a prostate MRI has been done. Fusion biopsy is most clearly indicated when your MRI shows a suspicious area, or when a previous biopsy was negative but concern about your PSA remains. Your urologist can explain which investigation pathway fits your situation.

Full index

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