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The Diff\u2010Quick touch preparation of the lymph node revealed abundant single cells and loose aggregates of cells with round to oval nuclei and deeply basophilic granules. Monotonous proliferation of small mature lymphocytes and many eosinophils were also present in the background. No evidence of metastatic carcinoma was seen. The frozen section and permanent sections of lymph node showed partial to complete replacement of lymph node by neoplastic mast cells. We present the cytologic findings of this unique case in addition to a brief discussion of systemic mastocytosis in the setting of another malignancy. Diagn. Cytopathol. 2007;35:728\u2013733. \u00a9 2007 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/dc.20737","type":"journal-article","created":{"date-parts":[[2007,10,8]],"date-time":"2007-10-08T17:47:46Z","timestamp":1191865666000},"page":"728-733","source":"Crossref","is-referenced-by-count":6,"title":["Systemic mastocytosis associated with small lymphocytic lymphoma: An incidental finding in a patient with invasive gastric adenocarcinoma"],"prefix":"10.1002","volume":"35","author":[{"given":"Caron","family":"Steinmetz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmed","family":"Shabaik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Farnaz","family":"Hasteh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,10,8]]},"reference":[{"key":"e_1_2_1_2_2","first-page":"291","volume-title":"World Health Organization (WHO) classification of tumors. 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