Diagnosis
Transperineal prostate biopsy: the procedure that confirms the diagnosis
The biopsy is the only test capable of confirming prostate cancer. Two approaches exist: the traditional transrectal approach and the transperineal approach, which avoids passing through the rectum. Our center performs both, and the choice is discussed on a case-by-case basis.
Transperineal or transrectal: the comparison
Both techniques take the same tissue and answer the same question. They differ in the path taken to reach the prostate—and this anatomical detail has concrete consequences.
| Criterion | Transperineal route | Transrectal route |
|---|---|---|
| Needle track | Through the skin, between the anus and the scrotum | Through the wall of the rectum |
| Infectious risk | Significantly reduced: no contact with rectal flora | Higher, despite antibiotic prophylaxis |
| Anesthesia | Most common location | Locale |
| Access to the anterior zone | Good access, including to the apex | Front areas more difficult to reach |
| MRI-fusion targeting | Possible | Possible |
| Rectal bleeding | Absent | Frequent, usually benign |
| Preparation | Antibiotic prophylaxis often streamlined | Enema and antibiotic therapy |
| Duration | About 20 minutes | About 15 minutes |
| Main limit | Requires an adapted tray and organization | Infectious risk, limited prior access |
Data from international literature and the center's practice. The choice of approach is considered on a case-by-case basis, depending on the anatomy, the location of the lesion, and the medical history.
In practice, the transperineal approach has established itself in recent years as the standard option when the technical infrastructure permits, mainly for one reason: it eliminates the passage of the needle through the rectum, and therefore the inoculation of digestive bacteria into the prostate. This explains the clear reduction in the risk of acute prostatitis following a biopsy.
Nevertheless, the transrectal route retains indications. It remains rapid, well-controlled, and perfectly suited to certain situations. We do both the choice is based on anatomical criteria and not on the available technique.
MRI-ultrasound fusion: targeting rather than probing
Definition
The fusion biopsy superpose the images of the'multiparametric MRI, carried out beforehand, to the ultrasound performed in real time during the procedure. The practitioner thus sees the lesion identified on the MRI directly on their ultrasound screen and guides the needle toward it.
This approach has replaced so-called systematic biopsies, which blindly took a dozen samples distributed throughout the gland in the hope of stumbling upon the tumor. Targeting changes three things.
- Fewer missed cancers — the suspicious lesion is sampled wherever it is located, including in the anterior areas
- Fewer unnecessary tests — so less bleeding and discomfort
- A more reliable grade sampling the heart of the lesion avoids underestimating its aggressiveness
Note that fusion is possible via both routes, transperineal as well as transrectal. It therefore does not oppose them: it adds to them.
MRI first, biopsy second
A multiparametric MRI is performed before any first biopsy. It localizes suspicious areas and, in certain low-risk situations, even makes it possible to dispense with taking a sample.
A biopsy is never triggered by an isolated elevated PSA.
The course of the exam
- PreparationMRI data and the PSA level determine the areas to be biopsied. Depending on the approach chosen, antibiotic prophylaxis and, for the transrectal approach, an enema are prescribed.
- Setup and anesthesiaThe procedure is most often performed under local anesthesia. You remain conscious and can communicate with the team.
- Ultrasound localizationAn ultrasound probe is inserted. The MRI images are fused with the real-time ultrasound, which targets the lesion.
- WithdrawalsThe needles pass through the skin of the perineum, between the anus and the scrotum, without passing through the rectum. Fragments are taken from the lesion and, depending on the indication, from the rest of the gland.
- AnalyzeThe fragments are sent to the pathology laboratory. This analysis takes several days: it is what confirms or rules out the diagnosis and establishes its grade.
The whole thing takes about twenty minutes. You leave the same day, after a short period of observation.
Save time
MRI and biopsy on the same day
Our checkup in one day combines PSA testing, imaging and, when justified by the MRI, targeted biopsy — instead of waiting several weeks between each step.
The aftermath and risks
A prostate biopsy remains an invasive procedure, even if minimally invasive. Its aftermath is usually uncomplicated, but these must be known before giving consent.
What is common and benign
- Blood in the urine — a few days, sometimes a week
- Blood in semen — often longer, up to several weeks, without being serious
- Perineal discomfort or moderate pain at the puncture site
- Transient difficulty urinating, linked to the edema
What is rarer
- Urinary tract infection or acute prostatitis — significantly less frequent via the transperineal route, that is its main argument
- Acute urinary retention requiring a temporary survey
- Heavy bleeding, exceptional
Fever, chills, or an inability to urinate in the following days require immediate medical consultation. These situations remain rare, but they must not be neglected.
Convalescence
A few days are enough. It is advisable to avoid strenuous exercise, cycling, and sexual intercourse for about a week, as well as driving within twenty-four hours of the procedure if sedation was used.
Read the results
The pathology report does not simply confirm or rule out cancer. It describes three elements that will determine the next steps.
- Nature — the vast majority of prostate cancers are adenocarcinomas, which develop from glandular cells
- The rank — the Gleason score, translated into ISUP grades from 1 to 5, measures aggressiveness. It is the most decisive parameter
- The expanse — the number of involved fragments and the length of tumor tissue on each
These elements, combined with the PSA and MRI, guide the strategy: active surveillance, focal treatment, surgery or radiotherapy. A negative result, on the other hand, does not always close the case: depending on the level of suspicion, PSA monitoring or new imaging may be offered.
When is a biopsy justified?
It is never automatic. Three elements combine to offer it.
- A Elevated PSA, interpreted according to age, prostate volume, density, and progression
- A abnormality on digital rectal examination
- A suspicious lesion on MRI, classified according to PI-RADS standards
Conversely, a normal MRI in a patient with a low PSA density and no particular risk factor may lead to favoring simple surveillance. Avoiding an unnecessary biopsy is part of the proper use of this examination.
The complete pre-biopsy assessment · Where the examination is performed
Frequently asked questions
Is the prostate biopsy painful?
It is carried out under local anaesthetic and remains bearable. Perineal discomfort and a sensation of pressure are common during the procedure. The transperineal approach, which does not pass through the rectum, is generally better tolerated.
How long does the bleeding last?
Blood in the urine lasts from a few days to a week. Blood in the semen can persist for several weeks: it looks alarming but is harmless, and does not warrant particular concern.
Can we drive after a biopsy?
If sedation was used, you must wait at least twenty-four hours and be accompanied home. With simple local anesthesia, driving is possible, but it is better to arrange for an accompanied return the same day.
Is hospitalization necessary?
No. The test is performed in ambulatory, with a few hours of monitoring. You go home the same day.
When do we get the results?
The histopathological analysis takes several days. This is the only delay that no organization can shorten: the samples must be prepared, sliced, and read under a microscope.
Does a negative biopsy definitively rule out cancer?
Not always. A fusion-targeted biopsy greatly reduces the risk of missing a lesion, but PSA monitoring is still recommended when clinical suspicion persists.
Have your file proofread
Send your latest PSA level, your MRI report, and any previous biopsies. We will tell you if a biopsy is warranted and by which approach.
Prostate Center — Blomet Clinic
136 bis rue Blomet, 75015 Paris · Monday to Saturday, 9 AM – 6 PM · +33 6 32 84 14 31
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Editorial responsibility. Medical content written and validated under the responsibility of Dr. Antoine Hakimé, interventional radiologist. Last medical review: September 2026. The information presented is for informational purposes and does not replace a medical consultation. The choice of the access route and the indication for the biopsy are determined by an individual assessment.