Neuroma
Solitary circumscribed neuroma
Specialty	Oncology

Aneuroma (/njʊəˈroʊmə/; plural:neuromata orneuromas) is a growth ortumor ofnerve tissue.^[1] Neuromas tend to bebenign (i.e. notcancerous); manynerve tumors, including those that are commonlymalignant, are nowadays referred to by other terms.

Neuromas can arise from different types ofnervous tissue, including thenerve fibers and theirmyelin sheath, as in the case of genuineneoplasms (growths) likeganglioneuromas andneurinomas.

The term is also used to refer to any swelling of a nerve, even in the absence of abnormalcell growth. In particular,traumatic neuroma results from trauma to a nerve, often during a surgical procedure.Morton's neuroma affects the foot.Neuromas can be painful, or sometimes, as in the case ofacoustic neuromas, can give rise to other symptoms.

• Acoustic neuroma - a slow-growing, benign tumor of theacoustic nerve.^[2] Symptoms, which most often start after the age of 30, can includedizziness,headache,vertigo,loss of balance,ringing sensations, andnumbness.^[3]
• Ganglioneuroma - a tumor of thesympathetic nervefibers arising fromneural crest cells.^[4]
• Pacinian neuroma - a very rare, painful, benignhyperplastic tumor ofPacinian corpuscles (mechanoreceptors responsible for sensitivity tovibration andpressure), sometimes linked to a history of localtrauma.^[5]

Some of the benign varieties of neuroma, in the broadest sense of the term, are notneoplasms.

• 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 acholecystectomy). They are often very painful. Synonyms include scar neuroma, amputation neuroma, or pseudoneuroma.
• Morton's neuroma (amononeuropathy of the foot) is another example of the more general usage of the termneuroma. Some prefer the term "Morton'smetatarsalgia", thus avoiding the termneuroma and its association with tumors.^[6]

The stemneuro- originates from the Greek word fornerve (νεῦρον), while the suffix-oma (-ωμα) denotesswelling.^[7] The stem does not imply that neuromas necessarily arise fromneurons; neuromas generally arise from non-neuronal nerve tissues. The word was originally used to refer to any nerve tumor, but its meaning has evolved.^[7]

• Neurological disorders
• Nervous system neoplasia

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• Short description is different from Wikidata