A 59-year-old man was admitted to our hospital because of fever in August 1991. Bone marrow showed normocellularity with 41.5% of CD13, 14, 33 positive blasts, and a diagnosis of AMMoL was made. Laboratory investigation revealed hyponatremia and elevated serum ADH level, indicating the syndrome of inappropriate secretion of antidiuretic hormone (SIADH). Intensive chemotherapy successfully induced hematological complete remission and his serum sodium level became normal. In February 1992, he developed proteinuria and findings were consistent with nephrotic syndrome (NS). Renal biopsy specimen showed membranous proliferative glomerulonephritis and massive infiltration of macrophages, and his serum interleukin 6 level was elevated. Five months later, he suffered from pancytopenia and elevation of biliary enzymes with increase of hemophagocytic histiocytes in his bone marrow (hemophagocytic syndrome). He transiently responded to low dose chemotherapy but he died due to severe infection. It is interesting that association between macrophages and/or cytokines with these various complications was suggested in AMMoL.