Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The heart appears mildly enlarged . There are linear densities projecting over the lower lungs bilaterally which appear most compatible with atelectasis . There is no convincing evidence for pneumonia , edema , effusion or pneumothorax . The mediastinal contour appears normal . The imaged bony structures are intact .
    OUTPUT:
    
Cardiomegaly with lower lung atelectasis .