Rectus sheath hematoma may present as a painful mass in the anterior abdominal wall. The underlying reasons may vary, while anticoagulant use and thromboembolism prophylaxis are documented causes. Treatment is mostly conservative however interventional procedures can be required. We herein present a case of 76-year-old patient with an uncontrolled rectus hematoma despite surgical hemostasis. The patient was treated succesfully by applying hemostatic matrix (Floseal).