These are firm ( sometimes soft ) painless subcutaneous lumps often aligned lengthwise in the long axis of a limb in relation to peripheral nerves 

What is neurofibromatosis?

Neurofibromatosis (NF) is a genetic disorder that affects the bone, soft tissue, skin and nervous system. Clinical manifestations increase over time.
The extent and severity of manifestations of NF vary greatly from person to person and varies within the same family.
 
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