Schwannomas, also known as neurilemmoma, is a benign tumour that originates from Schwann cells, which are cells that produce the myelin sheath that covers nerve fibres. These tumours typically grow on peripheral nerves, which are the nerves that extend outside the brain and spinal cord.

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Schwannomas are usually slow-growing and noncancerous. They are encapsulated tumours, meaning they are surrounded by a fibrous capsule. Schwannomas can occur in various parts of the body, including the head, neck, extremities, and along spinal nerves.

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Symptoms of schwannomas can vary depending on the location and size of the tumour. Common symptoms may include pain, tingling, numbness, weakness, or a palpable mass in the affected area. In many cases, schwannomas are discovered incidentally during imaging studies performed for other reasons.

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Treatment for schwannomas often involves surgical removal of the tumour, especially if it is causing symptoms or affecting nerve function. In some cases, observation with regular monitoring may be recommended if the tumour is small and not causing significant issues. Radiation therapy or other treatment modalities may be considered in certain situations.