Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size remains moderately enlarged . The mediastinal and hilar contours are similar . There is mild upper zone vascular redistribution without overt pulmonary edema . Linear opacities in the lung bases are are compatible with areas of subsegmental atelectasis . Evaluation of the lung apices is somewhat obscured by the soft tissues of the neck projecting over this region . No pneumothorax or large pleural effusion is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild pulmonary vascular engorgement and bibasilar subsegmental atelectasis .