Diagnosis of acute tendon tears of the pectoralis major muscle in patient 2. Clinical photograph of the patient shows ecchymosis over the anterior aspect of the right arm 2 days after injury (A, black arrows) and loss of the axillary fold (A, white arrows inside the black circle; the dotted black circle indicates the normal left side). Magnetic resonance imaging (MRI) with axial (B) and coronal (C) views; spin echo T2-weighted image shows disruption of the tendon of the pectoralis major (PM) muscle. The area of high signal intensity has a fluid-fluid level (B and C, white arrows), which was thought to indicate a loculated hematoma. PM, pectoralis major; H, humerus; HH, humeral head.