Organ Systems, Bone Marrow, Lymph Node, WHO Classification, Hematopathology B-PLL November 6, 2017 peferguson B-Cell Prolymphocytic Leukemia A rare mature B-cell leukemia (~1% of cases) composed of medium sized lymphoid cells (2x size of normal lymphocyte), which typically has splenic and bone marrow involvement. Continue reading B-PLL →