Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal mediastinal and hilar contours . Normal heart size . Rounded , soft tissue density in the right cardiophrenic sulcus is stable over multiple examinations and likely reflects a pericardial cyst . Multiple , healed , left rib fractures are again seen . No evidence of acute fracture . Lungs are clear . No pneumothorax . There are stable , severe degenerative changes involving the left glenohumeral joint . Interval resolution of small , left pleural effusion .
    OUTPUT:
    
No evidence of pneumonia .