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Urticaria Pigmentosa/Maculopapular Cutaneous Mastocytosis
Definition 1
The most frequent form of cutaneous mastocytosis. In children, the lesions tend to be papular, and are characterized by aggregates of elongated or spindle-shaped mast cells which fill the papillary dermis and extend into the reticular dermis. In adults, the lesions tend to have fewer mast cells compared to those in children. The lesions are located most commonly on the trunk, but they can be seen on the extremities, head and neck. (NCI Thesaurus/WHO)
Definition 2
The most common form of cutaneous mastocytosis (MASTOCYTOSIS, CUTANEOUS) that occurs primarily in children. It is characterized by the multiple small reddish-brown pigmented pruritic macules and papules. (NLM, Medical Subject Headings)
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