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In medicine, histiocytosis refers to an excessive number of histiocytes,〔(Histiocytosis ) at eMedicine Dictionary〕 (''tissue macrophages''), and is typically used to refer to a group of rare diseases which share this as a characteristic. Occasionally and confusingly, the term "histiocytosis" is sometimes used to refer to individual diseases. According to the Histiocytosis Association of America, 1 in 200,000 children in the United States are born with histiocytosis each year.〔(Disease information ) at the Histiocytosis Association of America〕 HAA also states that most of the people diagnosed with histiocytosis are children under the age of 10, although the disease can afflict adults. The University of California, San Francisco, states that the disease usually occurs from birth to age 15.〔(Histiocytosis - Signs and Symptoms )〕 Histiocytosis (and malignant histiocytosis) are both important in veterinary as well as human pathology. ==Classification, and relationships to other conditions== There are competing systems for classifying histiocytoses. According to the 1999 classification proposed by the World Health Organization, they can be divided into three categories. However, the classifications in ICD10 and MeSH are slightly different, as shown below: Types of LCH have also been known as "Eosinophilic Granuloma", "Hand-Schuller-Christian Disease", "Letterer-Siwe Disease", and "Histiocytosis X". (See Langerhans cell histiocytosis for details). Alternatively, histiocytoses may be divided into the following groups: : * X-type histiocytoses : * Non-X histiocytoses 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Histiocytosis」の詳細全文を読む スポンサード リンク
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