Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low , resulting in bronchovascular crowding . The heart is top - normal in size . There is pulmonary vascular congestion , without evidence of frank pulmonary edema . Left basilar opacity likely reflects atelectasis , and may be responsible for leftward mediastinal shift . No pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Pulmonary vascular congestion without frank edema . 2 . Left basilar opacity likely reflects atelectasis .