A neuroma is any tumor of cells of the nervous system. They can be either benign or malignant.
The most common type is a traumatic neuroma, which follows nerve injury (often as a result of surgery). They occur at the end of injured nerve fibres as a form of uneffective, 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.
Other neuromas can be categorised:
A special form of neuroma (named Morton's neuroma) occurs in the feet, near the distal metatarsal ends, by chronic pressure trauma to small nerve fibers related to gait; damaged nerve fibers are both fibrotic and hyperplastic.
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