histiocytic sarcoma

{{Short description|Tumor derived from histiocytes}}

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Histiocytic sarcoma is a tumor derived from histiocytes.{{cite journal|vauthors=Yoshida C, Takeuchi M |title=Histiocytic sarcoma: identification of its histiocytic origin using immunohistochemistry |journal=Intern. Med. |volume=47 |issue=3 |pages=165–9 |year=2008 |pmid=18239326 |doi=10.2169/internalmedicine.47.0386 |doi-access=free }} The tumor is often positive for CD163{{cite journal |vauthors=Vos JA, Abbondanzo SL, Barekman CL, Andriko JW, Miettinen M, Aguilera NS |title=Histiocytic sarcoma: a study of five cases including the histiocyte marker CD163 |journal=Mod. Pathol. |volume=18 |issue=5 |pages=693–704 |date=May 2005 |pmid=15696128 |doi=10.1038/modpathol.3800346|doi-access=free }} and can appear in the thyroid.{{cite journal |vauthors=De Vos FY, Gerding MN, Arends JW, Wegman JJ |title=Histiocytic sarcoma localised in the thyroid: a case report |journal=Ann. Hematol. |volume=87 |issue=8 |pages=681–2 |date=August 2008 |pmid=18386009 |pmc=2441588 |doi=10.1007/s00277-008-0473-0}} However, in some cases it can also appear in the brain.