From January 1975 to March 1978, 18 cases of chronic myelogenous leukemia diagnosed at Kyungpook National University Hospital were tested by hepatosplenic scanniny with 198Au Colloidal gold. The photo scanning findings in relation to clinical and laboratory findings are following. 1) Male to female ratio was 2:1 and 2nd and 3rd decades were predominant. 2) No focal space-occupying lesion was noticed both in the liver and spleen. 3) 4 Cases revealed well visualization of spleen, 7 cases poor visualization, and 7 cases nonvisualization. 4) No significant difference between well visualization group and poor visualization group was noted in clinical findings, liver function test and hematologic findings. 5) Cases with nonvisualization of the spleen tended to be associated with thrombocytopenia, decreased megakaryocytes in the marrow and longer duration of the illness.