Imaging
Can an MRI show pudendal neuralgia?
Almost every patient arrives with a normal pelvic MRI and the conclusion that nothing is wrong. The scan was probably right — and completely irrelevant. Here is what imaging can and cannot tell you about the pudendal nerve.
Why the standard MRI came back normal
A routine pelvic MRI is built to assess the prostate, uterus, bladder and bowel. Its slice thickness and sequences average away the small signal of a peripheral nerve. The pudendal nerve simply is not visible on it.
So a normal report means 'no organ disease found'. It does not mean 'the nerve is healthy'.
What MR neurography adds
Dedicated MR neurography uses high field strength, fat suppression and nerve-weighted sequences to make the nerve itself visible.
- Pudendal nerve hyperintensity and swelling
- Side-to-side asymmetry at the ischial spine or Alcock canal
- Compression by the sacrospinous or sacrotuberous ligament
- Post-surgical scar or mesh involvement
- Coexisting sciatic, piriformis or cluneal nerve pathology
Imaging never outranks the block
Pudendal neuralgia remains a clinical diagnosis under the Nantes criteria. The strongest single predictor of surgical benefit is a clear response to an image-guided pudendal nerve block at the suspected entrapment site — not the scan.
We use neurography to plan the operation and to detect coexisting nerve problems, not to grant or refuse the diagnosis.
Common questions
Can an MRI show pudendal neuralgia?
A standard pelvic MRI usually cannot. Routine sequences are optimised for organs and bone and do not resolve the pudendal nerve. Dedicated MR neurography — a 3 Tesla, fat-suppressed, nerve-specific protocol — can show pudendal nerve swelling, asymmetry and entrapment, but even then a normal scan does not exclude the diagnosis.
Why was my MRI normal if I'm in this much pain?
Because the nerve was almost certainly never imaged. Pudendal neuralgia is a clinical diagnosis made on the Nantes criteria; imaging supports it but does not define it. A 'normal MRI' report is one of the main reasons patients are wrongly told the pain is psychological.
What is the best scan for pudendal nerve entrapment?
3T MR neurography of the pelvis with dedicated nerve sequences, read by a radiologist who regularly reports pelvic nerve studies. Interpretation expertise matters as much as the magnet.
Do I need a scan before a pudendal nerve block?
Not necessarily. Many specialists proceed directly to an image-guided diagnostic block, which is often more informative than imaging. Neurography becomes important when surgery is being planned or when sciatic, cluneal or piriformis involvement is suspected.
Can CT or ultrasound diagnose pudendal neuralgia?
No. CT is used to guide injections, and ultrasound can guide a block at the ischial spine, but neither visualises nerve pathology well enough to make or exclude the diagnosis.
Speak with a pudendal nerve specialist.
Dr Renaud Bollens leads a specialist practice dedicated to chronic pelvic pain, with centers in Dubai and Belgium.