Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Left basilar opacity is identified which may be due to atelectasis versus infection . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities are identified . Lucency below the right hemidiaphragm was subsequently shown to be free intraperitoneal air identified on chest CT .
    OUTPUT:
    
Left basilar opacity , potentially atelectasis or infection . Lucency below the right hemidiaphragm on the frontal view subsequently shown to be free intraperitoneal air on CT scan . This was known by the clinical team at time of dictation .