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Neuroma

Neuroma is a growth or tumor of nerve tissue.

In its most general sense, neuroma can be applied to any swelling of a nerve. Thus, there are a variety of usages that don't refer to neoplastic tumors.

Traumatic neuroma follows different forms of nerve injury (often as a result of surgery). They occur at the end of injured nerve fibres as a form of ineffective, unregulated nerve regeneration; it occurs most commonly near a scar, either superficially (skin, subcutaneous fat) or deep (e.g., after a cholecystectomy). They are often very painful. It is also known as "pseudoneuroma".

Morton's neuroma (a mononeuropathy of the foot) is another example of the older, more general usage of neuroma. Some prefer the term "Morton's metatarsalgia", thus avoiding the term neuroma and its association with tumors.