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Notalgia paresthetica
Notalgia paraesthetica or notalgia paresthetica (also known as "Hereditary localized pruritus", "Posterior pigmented pruritic patch", and "Subscapular pruritus") is a chronic sensory neuropathy. Notalgia paraesthetica is a common localized itch, affecting mainly the interscapular area (especially the T2–T6 dermatomes) but occasionally with a more widespread distribution, involving the shoulders, back, and upper chest.〔Freedberg, et al. (2003). ''Fitzpatrick's Dermatology in General Medicine''. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.〕 The characteristic symptom is pruritus (itch or sensation that makes a person want to scratch) on the back, usually on the left hand side below the shoulder blade (mid to upper back). It is occasionally accompanied by pain, paresthesia (pins and needles), or hyperesthesia (unusual or pathologically increased sensitivity of the skin to sensory stimuli, such as pain, heat, cold, or touch), which results in a well circumscribed hyperpigmentation of a skin patch in the affected area.
The causes or origin of this condition (etiology) have not yet been completely defined. Patients are usually older persons.〔http://www.skinsight.com/adult/notalgiaParaesthetica.htm〕
==Causes==
The correlation of notalgia paraesthetica localization with corresponding degenerative changes in the spine suggest that spinal nerve impingement may be a contributing cause. According to Plete and Massey, "The posterior rami of spinal nerves arising in T2 through T6 are unique in that they pursue a right-angle course through the multifidus spinae muscle, and this particular circumstance may predispose them to harm from otherwise innocuous insults of a varied nature." Patients may have other conditions that predispose them to peripheral neuropathies (nerve damage).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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