Bone marrow embolism (BME) was found in 80 out of 507 consecutive autopsies (15.7 per cent). BME was associated with accident in more than 50 per cent and with cardiac disease in approximately 25 per cent of the cases. Mechanisms for the production of BME other than fracture must be sought since 8 per cent of the cases did not have any bone involvement. BME should not be considered proof of antecedent intravital trauma and pulmonary BME did not appear to have any clinical significance.