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Muscle and nerve biopsy
Category: Brain, Nerve & Sleep Tests · All brain, nerve & sleep tests
What it is
A muscle biopsy removes a small piece of muscle (usually from the thigh or upper arm) for microscopic and biochemical analysis when a muscle disease is suspected. A nerve biopsy (usually the sural nerve at the ankle) samples a sensory nerve when a neuropathy's cause remains elusive, such as suspected vasculitis or amyloidosis.
Why it is done
They are used selectively after blood tests, EMG and imaging — for inflammatory muscle disease, metabolic and genetic myopathies, and for neuropathies where identifying a treatable cause (like vasculitis) would change management.
How to prepare
Blood tests and medication review come first; blood thinners may need planning. The muscle site is chosen from examination and MRI (a moderately affected muscle, not an end-stage or recently EMG-needled one). You may need to fast if sedation or general anaesthetic is planned (children usually have general anaesthetic).
What happens during the procedure
Through a small cut under local anaesthetic (open biopsy, giving a good-sized specimen) the surgeon removes a small cube of muscle, sometimes with a needle technique instead. Sural nerve biopsy takes a short length of the sensory nerve behind the ankle. The procedures take about 30 to 45 minutes.
Afterwards — recovery & results
The wound heals over one to two weeks; the biopsied leg or arm may ache for some days. Sural nerve biopsy leaves a permanently numb patch on the outer foot — expected and explained beforehand. Analysis is detailed and can take several weeks, sometimes with samples sent to specialist centres.
Risks & considerations
Risks include bleeding, infection, scar discomfort, and (for nerve biopsy) the permanent numb patch and occasionally persistent pain at the site. The information gained is weighed carefully because these tests are reserved for questions other tests cannot answer.
Watch: Muscle and nerve biopsy videos
Real procedure videos from the MedicalVideos.com library. Some clinical footage is graphic — that is the nature of a medical video library.
Related guides on MedicalVideos.com
Frequently asked questions
Why not rely on genetic blood tests instead?
Genetics answers many cases first-line now, but muscle tissue still shows inflammation, structural changes and storage problems that genes alone cannot, and sometimes points to which gene to examine.
Will the biopsy weaken my leg?
The specimen is small relative to the muscle; lasting weakness from the biopsy itself is not expected.
Related procedures — Brain, Nerve & Sleep Tests
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