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Diagnostic Pathology BioMed Central Case Report Open Access Synchronously diagnosed lymph nodal collision tumor of malignant melanoma and chonic lymphocytic leukemia/small lymphocytic lymphoma: case report 1 2 2 2 Dina El Demellawy , Catherine Ross , Monalisa Sur and Salem Alowami* Address: 1Northern Ontario School of Medicine, Department Of Pathology and Laboratory Medicine, West Campus, Thunder Bay, Ontario, Canada and 2McMaster University, Department Of Pathology and Molecular Medicine, Hamilton, Ontario, Canada Email: Dina El Demellawy - dina_eldemellawy@; Catherine Ross - rossc@hhsc.ca; Monalisa Sur - surm@hhsc.ca; Salem Alowami* - alowami@hhsc.ca * Corresponding author Published: 30 August 2007 Received: 24 May 2007 Accepted: 30 August 2007 Diagnostic Pathology 2007, 2:34 doi:10.1186/1746-1596-2-34 This article is available from: /content/2/1/34 © 2007 El Demellawy et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Synchronous composite tumors have been described but are uncommon. Moreover, simultaneous occurrence of synchronous tumors in the same tissue or organ is even less common. We report a case of chronic lymphocytic leukemia (CLL)/small lymphocytic lymp