Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP semi-upright view of the chest was obtained . Cardiomediastinal silhouette including mild cardiomegaly is unchanged . Left lower lung opacities are mild atelectasis or aspiration . Lungs are otherwise clear . There is no pleural effusion or pneumothorax . No displaced rib fractures identified .
    OUTPUT:
    
1 . Stable mild cardiomegaly . 2 . Left basilar atelectasis or aspiration . 3 . No discrete fracture is identified ; however , please note that conventional chest radiography is not sensitive for detection of rib fractures . Detail views of focal findings , radiographically marked , recommended if detection is clinically indicated .