What is a Transperineal MRI Fusion Prostate Biopsy?

A transperineal MRI fusion prostate biopsy is a procedure used to obtain small tissue samples from the prostate gland to check for prostate cancer.

The biopsy combines:

  • MRI imaging, which identifies suspicious areas in the prostate

  • Real-time ultrasound guidance, which allows the doctor to precisely target these areas during the biopsy

This technique improves the accuracy of cancer detection compared with traditional biopsy methods.

The procedure is performed under general anaesthetic, meaning you will be asleep during the procedure.

Transperineal MRI Fusion Prostate Biopsy

A medical model of a human prostate gland and urinary system, held by a gloved hand, with a pen pointing towards the model.

Why is this procedure recommended?

Your doctor may recommend this biopsy if:

  • Your PSA (Prostate Specific Antigen) level is elevated

  • An MRI scan has shown suspicious areas in the prostate

  • You have had a previous negative biopsy but ongoing concern

  • There are abnormal findings on prostate examination

The biopsy allows doctors to determine whether prostate cancer is present and, if so, how aggressive it may be.

How is the procedure performed?

The biopsy is performed in an operating theatre under general anaesthetic.

During the procedure:

  1. You will be placed under general anaesthesia.

  2. You will lie on your back with your legs supported.

  3. An ultrasound probe is gently inserted into the rectum to visualise the prostate.

  4. Your previously performed MRI scan is digitally fused with the ultrasound images to guide the biopsy.

  5. Small biopsy needles are inserted through the skin between the scrotum and anus (the perineum).

  6. Several small tissue samples are taken from both targeted MRI areas and other parts of the prostate.

The procedure typically takes 20–40 minutes.

Advantages of the Transperineal Approach

Compared with older biopsy methods, the transperineal approach has several benefits:

  • Lower risk of infection

  • Improved cancer detection

  • Better sampling of all areas of the prostate

  • Reduced need for repeat biopsy

Preparation Before the Procedure

Your doctor will provide specific instructions. These may include:

  • Stopping certain blood-thinning medications before the procedure

  • Having blood tests if required

  • Fasting for 6 hours before the anaesthetic

  • Arranging for someone to drive you home

You may also be given preventative antibiotics.

What to Expect After the Procedure

Most patients go home the same day after recovery from the anaesthetic.

Common temporary effects include:

  • Blood in the urine for several days

  • Blood in the semen for several weeks

  • Mild discomfort or bruising in the perineal area

  • Mild burning when urinating

These symptoms usually resolve on their own.

You should avoid heavy exercise and strenuous activity for 24–48 hours.

Possible Risks and Complications

This is generally a safe procedure, but possible risks include:

  • Urinary infection

  • Difficulty passing urine (temporary urinary retention)

  • Bleeding in urine or semen

  • Bruising or discomfort in the perineum

  • Very rarely, significant bleeding or infection requiring treatment

The transperineal approach has a much lower risk of serious infection compared with traditional transrectal biopsies.

Results

Biopsy samples are sent to a laboratory for analysis by a specialist pathologist.

Results are usually available within 1–2 weeks. Your doctor will discuss:

  • Whether cancer is present

  • The grade and stage of any cancer detected

  • Possible treatment or monitoring options

Follow-Up

A follow-up appointment will be arranged to review your biopsy results and discuss the next steps in management.