Histiocytosis

Histiocytosis
Term	Histiocytosis
Short definition	histiocytoid hemangioma (SEIN-tee-oh-SY-toyd hee-MAN-jee-OH-muh) A rare benign (non-cancerous) tumor of small blood vessels, characterized by lymphocytes and eosinophils (species surrounded by white blood cells. Histiocytoid hemangiomas usually form on or in the skin, particularly the scalp, but can also occur in other areas of the body, such as the scalp.
Type	Cancer terms
Specialty	Oncology
Language	English
Source	NCI
Comments

Histiocytosis - (pronounced) (SEIN-tee-oh-sy-TOH-sis) A group of rare disorders in which too many histiocytes (a type of white blood cell) build up in certain tissues and organs, including skin , bones, spleen, liver, lungs and lymph nodes. This can cause tissue damage or tumors in one or more parts of the body. The tumor can be benign (not cancer) or malignant (cancer). There are several types of histiocytosis, including Langerhans cell histiocytosis (LCH), hemophagocytic lymphohistiocytosis (HLH), and histiocytic malignancies. Histiocytosis is most common in children but can occur at any age. Also called histiocytic neoplasia

External links

• Medical encyclopedia article on Histiocytosis
• Wikipedia's article - Histiocytosis

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