page_title: Histiocytosis
section_title: Diagnosis
hierarchical_section_title: Histiocytosis / Diagnosis
caption_attribution_description: English: Sinus histiocytosis of a lymph node (intermediate magnification). HE stain.
context_page_description: In medicine, histiocytosis is an excessive number of histiocytes, and the term is also often used to refer to a group of rare diseases which share this sign 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. 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 disease usually occurs from birth to age 15.
  Histiocytosis are both important in veterinary as well as human pathology.
caption: Sinus histiocytosis, a common feature in lymph node biopsies, is characterized by dilated sinuses containing variable numbers of histiocytes.[6]
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