Follicular lymphoma. The normal nodal architecture is effaced by nodular expansions of tumor cells. Nodules vary in size and contain predominantly small lymphocytes with cleaved nuclei along with variable numbers of larger cells with vesicular chromatin and prominent nucleoli. Source: Hematopoietic Disorders, Harrison's Principles of Internal Medicine, 19e Citation: Kasper D, Fauci A, Hauser S, Longo D, Jameson J, Loscalzo J. Harrison's Principles of Internal Medicine, 19e; 2015 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1130/kas_ch134_f007.png&sec=98711426&BookID=1130&ChapterSecID=79722272&imagename= Accessed: October 15, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved