A 53-year-old woman with injury of the right precordium sustained by falling against her bicycle handlebar was admitted to our hospital. She was not on regular medication with antiplatelet drugs. A hematoma was detected in the right breast, which showed a tendency towards increase in size despite cooling and rest to the injured area. CT revealed extravasation of contrast medium into the right breast suggestive of massive hemorrhage. Interventional radiology (IVR) failed to accomplish hemostasis. Therefore, emergency surgery was performed and the source of bleeding was ligated. The postoperative course was uneventful and the patient was discharged 8 days after the surgery. There was no wound infection or scarring. The wound was also esthetically acceptable. Although IVR is considered to be effective against arterial bleeding in cases of blunt trauma, surgery may be much more effective in cases where the source of bleeding can be accessed with comparative ease.