Hepatosplenic T-cell lymphoma involving the bone marrow. (A) Tumor cells in the bone marrow aspirate resemble blasts. They are medium-sized with dispersed chromatin and scant cytoplasm. (B) Two lymphoma cells display erythrophagocytosis. (C) Hypercellular bone marrow with almost all normal hematopoietic cells replaced by lymphoma cells growing in sheets. (D) Lymphoma cells located within the lumen of a sinus.