neurofibromatosis, neck pain
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I am sorry to hear of your daughter's pain. As you probably know, the plexiform neuromas and other lesions can grow almost anywhere along the nervous system, even though the most obvious lesions are those which we can see.
The vertebrae in the neck have small openings through which the passage of sensory nerves can get quite crowded (particularly in the distribution of the C2 sensory nerves). Any neuromas growing in this area can compress the affected nerve or other nearby nerves, resulting in considerable pain. Ibuprofen is probably the best over-the-counter treatment as long as it is not overused. Otherwise, try heat or cold compresses, and give your daughter a comfortable place to lie down. At her age, she can start to learn techniques such as progressive relaxation and bio-feedback.
Symptoms to watch out for are progressively increasing pain that does not respond to treatment or is accompanied by excessive neck stiffness and restricted range of motion.
Follow your pediatrician's advice, and continue to research this disease as much as you can (it sounds like you're doing a pretty good job already!)