MR neurography is an advanced neuroimaging technique useful for diagnosing disorders of peripheral nerves outside the spinal canal. It can help identify which spinal nerve is irritated in spine disorders, improving on standard spinal MRI. MR neurography allows uniform evaluation of any nerve in the body, expanding efficacy of nerve diagnosis compared to electromyography. It is commonly used to diagnose abnormalities in major nerve plexuses and deep proximal nerves, identifying nerve trauma, tumors, inflammation, and compression from conditions like disc disease. The technique uses thin, high-resolution sequences optimized to increase nerve tissue signal visibility and localize sites of nerve injury.

1. MagneticResonance
An innovation in neuroimaging
BY
MUHAMMED SWALIH MP
B.Sc INTERN
GANGA INSTITUTE OF HEALTH SCIENCES
COIMBATORE

2. MR neurography, or magnetic resonance neurography
(MRN), also known as MR Imaging of Peripheral
Nerves (PNI), is an advanced technique that is useful
for diagnosing disorders of the peripheral nerves
beyond the spinal canal.

3. Neurography has also been helpful for
improving image diagnosis in spine disorders. It can
help identify which spinal nerve is actually irritated as
a supplement to routine spinal MRI. Standard spinal
MRI only demonstrates the anatomy and
numerous disk bulges, bone spurs or stenosis that
may or may not actually cause nerve impingement
symptoms

4. Many nerves, such as the median and ulnar nerve in the arm or
the tibial nerve in the tarsal tunnel, are just below the skin
surface and can be tested for pathology with electromyography,
but this technique has always been difficult to apply for deep
proximal nerves. Magnetic resonance neurography has greatly
expanded the efficacy of nerve diagnosis by allowing uniform
evaluation of virtually any nerve in the body
Electromyography (EMG) is an electro diagnostic
medicine technique for evaluating and recording the electrical
activity produced by skeletal muscles.
EMG is performed using an instrument called
an electromyograph.

5. MR neurography can image nerves anywhere in the body.
It is most commonly used in the diagnosis of abnormalities
of the
 brachial plexus
lumbosacral plexus
thoracic outlet
sciatic nerves.

6. •Common nerve diseases that are evaluated with MRN.
Nerve trauma
 assessment of the extent of injury
Tumours
Inflammation
Radiation damage
Compression related to disc disease or entrapment.
evaluation of peripheral branch nerve abnormalities
and associated lesions

7. What actually done in MRN?
Thin section, high-resolution sequences are
performed that are dedicated to optimally increase
the conspicuity of nerve tissue signal. Being able to
view the nerves helps physicians to localize the site
of nerve injury and diagnose the underlying etiology.

8. Patient Safety Tips
Should leave valuables at home (e.g. jewellery)
If prefer not to change into hospital attire (e.g. gown),
please wear cotton clothing without metal zippers, hooks,
or buttons.
Ask before if in need of an attender.
Bring a list of your current medications with dosage
information.

9. • a) MRN protocol
• A magnetic field strength of 3 Tesla is
• advisable to achieve high-resolution
• images at the fascicular level of peripheral
• nerves.

11. Thank ou