Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Exam is limited by patient rotation . Heart size appears mildly enlarged but similar . Aortic knob is densely calcified . Mediastinal and hilar contours are grossly unremarkable . Lung volumes are low with crowding of the bronchovascular structures . Streaky retrocardiac atelectasis is likely present . No focal consolidation , pleural effusion or pneumothorax is identified . Degenerative changes involving both shoulders are partially imaged .
    OUTPUT:
    
Retrocardiac streaky atelectasis . Otherwise , no acute cardiopulmonary abnormality .