Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly . The mediastinal and hilar contours are unchanged . Low lung volumes are present with crowding of bronchovascular structures , but no overt pulmonary edema . Hazy opacities in the bilateral , left greater than right , lower lobes with the left lower lobe opacity having a peripheral triangular appearance on the lateral view . Blunting of the left costophrenic angle , likely representing a small pleural effusion . No right pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . No subdiaphragmatic free air .
    OUTPUT:
    
1 . Triangular peripheral morphology of the left lower lobe , compatible with infarction , as the subsequent abdominal pelvic CTA demonstrated a left lower lobe pulmonary embolism . Trace left pleural effusion . 2 . Bibasilar atelectasis . 3 . No subdiaphragmatic free air .