Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal contours are not widened . A streak of plate - like atelectasis is seen at the left base . There is no large pneumothorax or pleural effusion . No displaced rib fracture is identified . The right humeral head is high riding within the glenohumeral joint , signifying a chronic rotator cuff injury .
    OUTPUT:
    
No evidence of intrathoracic injury ; high - riding right humeral head is compatible with chronic rotator cuff injury .