PT - JOURNAL ARTICLE AU - Ghofrani, M. AU - Tantiwongkosi, B. AU - Smith, A.S. AU - Wasdahl, D.A. TI - Richter Transformation of Chronic Lymphocytic Leukemia Presenting as a Dural-Based Non-Hodgkin Lymphoma Mass DP - 2007 Feb 01 TA - American Journal of Neuroradiology PG - 318--320 VI - 28 IP - 2 4099 - http://www.ajnr.org/content/28/2/318.short 4100 - http://www.ajnr.org/content/28/2/318.full SO - Am. J. Neuroradiol.2007 Feb 01; 28 AB - SUMMARY: Richter transformation is defined as a diffuse large cell lymphoma, occurring by transformation of chronic lymphocytic leukemia (CLL). We present a 64-year-old man with a history of CLL and a left parieto-occipital transtentorial extra-axial mass. The patient underwent CT and MR imaging, demonstrating a large dural-based mass with extracranial extension, which occluded the left transverse sinus. Biopsy of the mass proved a pathologic diagnosis of diffuse large cell non-Hodgkin lymphoma, consistent with Richter transformation of CLL.