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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/10/13 23:31:22」(JST)

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A histiocytoma is a tumour consisting of histiocytes.^[1] Histiocytes are cells that are a part of the mononuclear phagocytic system, a part of the body's immune system that consists of phagocytic cells, which are responsible for engulfing solid particles by the cell membrane to form an internal phagosome by phagocytes and protists.

Types include:

benign fibrous histiocytoma
malignant fibrous histiocytoma
histiocytoma (dog)

References

^ "histiocytoma" at Dorland's Medical Dictionary

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English Journal

Malignant fibrous histiocytoma of the head and neck: a case series.

Hardison SA, Davis PL 3rd, Browne JD.SourceDepartment of Otolaryngology/Head and Neck Surgery, Wake Forest University School of Medicine, Winston Salem, NC, USA.
American journal of otolaryngology.Am J Otolaryngol.2013 Jan;34(1):10-5. doi: 10.1016/j.amjoto.2012.06.010. Epub 2012 Sep 20.
PURPOSE: The study objective is to evaluate the clinical features and outcomes of patients treated for head and neck malignant fibrous histiocytoma at a tertiary care medical facility.MATERIALS AND METHODS: This is a retrospective case series of 17 adult subjects with malignant fibrous histiocytoma
PMID 22999710

Benign anal and perianal polypoid neoplasms and tumor-like lesions.

Abdullgaffar B, Keloth T, Al-Hattawi M, Al Marzouqi M, Eltayeb Y.SourcePathology Section, Rashid Hospital, Oud Metha Road, Dubai, United Arab Emirates. Electronic address: badraah009@yahoo.com.
Pathology, research and practice.Pathol Res Pract.2012 Dec 15;208(12):719-25. doi: 10.1016/j.prp.2012.09.004. Epub 2012 Oct 22.
Mesenchymal anal and perianal tumors are relatively uncommon. The majority are malignant. Benign mesenchymal anal tumors are rare. Some are common stromal neoplasms, but with the rare presentation as anal polyps. Other lesions are rare, but unique to the anal/perianal region. Common keratinous cysts
PMID 23089289