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Spitz nevus
A Spitz nevus (also known as an epithelioid and spindle-cell nevus,〔 benign juvenile melanoma, and "Spitz's juvenile melanoma") is a benign melanocytic nevus, a type of skin lesion, affecting the epidermis and dermis.〔LeBoit, PE, Burg G, Weedon D, Sarasin A. (Eds) World Health Organization Classification of Tumours: Pathology and Genetics of Skin Tumours. Lyon: ''IARC''Press. 2006.〕
The name ''juvenile melanoma'' is generally no longer used as it is misleading: it is not a melanoma, it is a benign lesion; and it can also occur in adults, not only in children.〔Crotty, K. Spitz Naevus: Histological features and distinction from malignant melanoma. Australasian Journal of Dermatology. 38 (suppl): S49-S53. 1997.〕
==Epidemiology==
Spitz nevi are uncommon. Their annual incidence was estimated in a coastal population of sub-tropical Queensland to be 1.4 cases per 100,000 people. For comparison, the annual incidence of melanoma in the same population, which is high by world standards〔Ries LAG, et al., eds. SEER Cancer Statistics Review, 1975–2000. Bethesda, MD: National Cancer Institute; 2003: Tables XVI-1-9.〕 is 25.4 cases per 100,000 people.〔
Although they are most commonly found on people in their first two decades of life,〔 the age range for people with Spitz nevi is from 6 months to 71 years, with a mean age of 22 years and a median age of 19 years.〔
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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