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The tumor was excised, recurred within 2\u2009years, was reexcised after 4\u2009years and did not recur &gt;6\u2009years after diagnosis. The tumor showed progressive cytonuclear atypia and a high mitotic and proliferation rate by Ki67\u2010staining from the onset. No <jats:italic>KIT<\/jats:italic> mutations were identified in the tumor and bone marrow. Serum tryptase levels and a bone marrow aspirate and trephine biopsy were normal. Although the histomorphology of the skin tumor was consistent with mast cell sarcoma, the clinical behavior without systemic progression argued against this diagnosis. The tumor was finally considered as atypical mastocytoma, borderline to mast cell sarcoma. Currently, the patient is in close follow\u2010up and still in complete remission.<\/jats:p>","DOI":"10.1111\/cup.14088","type":"journal-article","created":{"date-parts":[[2021,6,21]],"date-time":"2021-06-21T12:25:14Z","timestamp":1624278314000},"page":"1404-1409","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Case report of a clinically indolent but morphologically high\u2010grade cutaneous mast cell tumor in an adult: Atypical cutaneous mastocytoma or mast cell sarcoma?"],"prefix":"10.1111","volume":"48","author":[{"given":"Claire L. W.","family":"Wardle","sequence":"first","affiliation":[{"name":"Department of Pathology and Medical Biology University Medical Centre Groningen  Groningen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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