Any tumor derived from the cells of the nervous system.
Two types : False neuroma & True neuroma
False neuroma :
It occurs due to injury to a nerve following a trauma or amputation which presents as a tender swelling.
It arises from connective tissue of nerve sheath.
It can be end neuroma, commonly seen in amputation stump as a tender localised firm swelling often adherent to the stump scar. It can cause neuralgia in the stump.
True neuroma :
It is rare tumor which occurs in connection with sympathetic system.
Types :
Ganglioneuroma :
It contains ganglion cells and nerve fibres
It occurs in connection with sympathetic chain. So it is observed in neck, thorax, retroperitoneum
It is relatively benign and symptomless
Neuroblastoma :
It is poorly differentiated, aggressive, embryonic type of tumor
It is seen in infants and children
It spreads through blood
Myelinitic neuroma :
It contains only nerve fibres
Ganglion cells are absent
It occurs in spinal cord and pia mater
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