Bone marrow appearances in reticulum cell sarcoma

18 patients with malignant lymphoma "histiocytic type" were investigated for the bone marrow involvement. Bone marrow aspirates and needle biopsies were used. Smears and sections of the aspirates were examined. The findings in the sections of both aspirates and biopsies were complementary and far more valuable than the bone marrow smears alone. It is concluded that bone marrow examination is helpful in determining the spread of the disease and should be repeated during the course of lymphoma.