Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . Aortic knob is calcified . Mediastinal and hilar contours are unremarkable . No pulmonary vascular congestion is present . Linear opacity in the left lower lobe is compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .