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A muscle biopsy is a minor surgical procedure that involves taking a small sample of muscle tissue for examination. It is usually performed under local anaesthesia, and the patient may also be given a sedative to help them relax. The procedure is often carried out on an outpatient basis, but it can also be done during a hospital stay. The muscle tissue sample is typically obtained by inserting a biopsy needle into the muscle, although a small incision may be made in the skin if a larger sample is required. The sample is then sent to a laboratory for detailed examination under a microscope, which can help diagnose various muscle diseases and abnormalities. While muscle biopsies are generally considered safe, they are not always 100% accurate, and there is a small risk of complications such as muscle hernias and accidental injuries to muscles, nerves, or blood vessels.
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What You'll Learn
Muscle biopsy procedure
A muscle biopsy is a minor surgical procedure used to diagnose diseases involving muscle tissue. The procedure is performed under local anaesthesia, and the muscle selected for the biopsy depends on the location of symptoms, which may include pain or weakness. The muscles often chosen for sampling include the bicep, deltoid, or quadriceps.
Before the procedure, the patient must be informed of the reason for the biopsy, the choice of biopsy site, the technique of biopsy, the risks, and possible complications. The patient will also be asked to remove their clothing and will be given a gown to wear. The skin over the biopsy site will then be cleaned with an antiseptic solution, and a local anaesthetic will be injected to numb the area.
During the procedure, a small incision is made in the skin, and a needle biopsy instrument is inserted. Ultrasound imaging is used to guide the instrument to the muscle, and small cuts are made to collect samples of muscle tissue. The number of tissue pieces collected varies depending on the technique used, but it is usually between four and five small pieces. Once the required amount of tissue has been obtained, the incision is closed with sutures (stitches) and covered with bandages and gauze.
After the biopsy, the muscle sample is promptly sent to a laboratory, where it is frozen and sectioned. Several routine stains are performed on the same day as the biopsy, and a preliminary report is provided to the treating physician. This report provides rapid information about the presence of inflammation or denervation. The sample may also be examined under a microscope by a pathologist specialising in neuromuscular diseases, who may perform additional tests such as applying stains or testing for specific antibodies.
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Muscle biopsy recovery
Muscle biopsy is a procedure used to diagnose diseases involving muscle tissue. A small portion of a specific muscle is removed and viewed under a microscope. The muscle selected for the biopsy depends on the location of symptoms, which may include pain or weakness. The bicep, deltoid, or quadriceps muscles are often chosen for sampling.
After the procedure, the wound is covered with bandages and gauze. You may experience some pain for two to three days, and the area may be sore for up to a week, especially if you have had an open biopsy. Bruising may also occur. Discuss pain management options with your healthcare provider. If you received sedation or general anesthesia, you will be monitored in a recovery room until the medication wears off.
Complications from muscle biopsies are rare but can include muscle hernia, accidental injury to the muscle, nerves, or blood vessels, and reopening of the wound. Some people may experience ongoing pain or numbness at the biopsy site, and scarring may occur. In rare cases, swelling and bruising may persist for weeks, and a hard lump (haematoma) may develop, accompanied by pain.
It is important to follow your healthcare provider's instructions for recovery and to ask any questions you may have. They will explain how and when you will receive your results, which are typically available within a few days to a week.
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Muscle biopsy complications
Muscle biopsies are a commonly ordered diagnostic procedure used to evaluate and diagnose patients with muscle weakness or pain. The procedure is generally safe, with a low risk of complications. However, as with any surgical procedure, there are some potential risks and complications that patients should be aware of.
One potential complication is muscle hernia, where the muscle protrudes through the fascia, or connective tissue. There is also a small risk of the wound reopening after the procedure. In rare cases, accidental injury to the muscle, nerves, or blood vessels may occur during the biopsy. Some patients may also experience scarring at the biopsy site, although this is typically more pronounced in some individuals than in others.
As with any procedure that breaks the skin, there is a risk of infection or bleeding. However, the incisions made during muscle biopsies are relatively small, especially for needle biopsies, so this risk is significantly lower than with other surgical procedures. There is also a small chance of damage to the muscle where the needle enters, but this is also rare.
It is important to note that a muscle biopsy should not be performed on a muscle that has been recently damaged by another procedure, such as an electromyography (EMG) test, or if there is known muscle damage from a previous injury. Patients should inform their healthcare provider of any muscle injections, muscle testing, or injuries before the procedure to avoid these complications.
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Muscle biopsy results
The results of a muscle biopsy will provide information on the characteristics of the muscle sample, including the structure, health, and "age" of the muscle fibers (cells). It will also describe other cells in the tissue, such as neurons (nerve cells), and look for signs of inflammation, mitochondrial abnormalities, and glycogen and lipid storage abnormalities.
The tissue sample collected during the procedure is sent to a lab for examination under a microscope by a pathologist specializing in neuromuscular diseases. The pathologist may perform additional tests on the sample, such as applying stains or testing for specific antibodies.
The results may be available within a few days to over a week, and your healthcare provider will explain the findings and their implications. If the results indicate a specific myopathy, your provider will discuss the condition and work with you to develop an appropriate treatment plan.
It is important to note that muscle biopsy results are just one aspect of a comprehensive diagnostic process, which may also include physical and neurological exams, blood tests, imaging tests, and nerve conduction studies.
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Reasons for a muscle biopsy
A muscle biopsy is a procedure used to diagnose diseases involving muscle tissue. Healthcare providers will recommend a muscle biopsy if patients are experiencing muscle weakness or pain and need a definitive diagnosis.
A muscle biopsy may be performed to help identify or detect:
- Neuromuscular disorders, such as Friedreich ataxia, Lou Gehrig disease (ALS), or muscular dystrophies like Duchenne muscular dystrophy, Becker muscular dystrophy, and myotonic dystrophy.
- Inflammatory diseases of the muscle, such as polymyositis or dermatomyositis, which cause muscle weakness, swelling, tenderness, and tissue damage.
- Diseases of the connective tissue and blood vessels, such as polyarteritis nodosa or necrotizing vasculitis.
- Infections that affect the muscles, such as trichinosis, toxoplasmosis, or parasitic infections caused by raw meat.
- Inherited muscle disorders, such as congenital myopathy, or muscular dystrophy.
- Abnormalities in the musculoskeletal system, such as problems with the nervous system, connective tissue, or vascular system.
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Frequently asked questions
A muscle biopsy is a minor surgical procedure that involves making an incision in the skin to obtain a few small pieces of the underlying muscle for detailed examination. It is used to diagnose diseases involving muscle tissue.
Your healthcare provider may recommend a muscle biopsy if you have symptoms of myopathy (like muscle weakness) and need a more definitive diagnosis. A muscle biopsy can help determine the source of the disease process and ensure proper treatment.
The muscle biopsy procedure is performed under local anaesthesia. Once the appropriate muscle is selected, the area is cleaned with antiseptic agents and anaesthesia is applied to the skin and subcutaneous tissue. An incision is made, and sharp scissors or a biopsy needle are used to remove small pieces of the muscle. The incision is then sutured and covered with a dressing.
