Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is ill - defined hazy opacification noted in the left retrocardiac region . Given recent endobronchial biopsy in this region , this may represent edema vs . bleeding or both . There is atelectasis at the right lung base . There are no pleural effusions or pneumothorax . Cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . Ill - defined hazy opacity in the left retrocardiac region , which may represent post - biopsy bleeding vs . edema . 2 . No pneumothorax .