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WHO Classification of Tumours
Extracutaneous mastocytoma
Tumours of haematopoietic and lymphoid tissues


This very rare localized tumour appears to occur esclusively in the lung
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Charrette EE, Mariano AV, Laforet EG. (1966)
Solitary mast cell "tumor" of lung. Its place in the spectrum of mast cell disease.
Arch Intern Med. 1966 Oct;118(4):358-62.

and consists of an accumulation of mature-appearing strongly metachromatic mast cells, in contrast to the highly atypical mast cells observed in a mast cell sarcoma
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Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele J, Vardiman JW (Eds.)
WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues
4th Edition
International Agency for Research on Cancer: Lyon 2008