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Some patients present with lymphocytosis although most have nodal disease on further investigation.
Morphology Monomorphic population of small to intermediate sized cells with irregular nuclei May have a nodular or diffuse growth pattern. A blastic variant is described which consists of larger lymphoid cells with a higher rate of cell proliferation. Replacement of nodal architecture, which may be diffuse or nodular. A monomorphic population of small cells with irregular nuclei. Intestinal MCL - CD20 immunoperoxidase staining of Peyer's patches.