Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Tracheostomy tube is identified . G tube not included on this film . Streaky left midlung opacity is consistent with probable scarring . The left hemidiaphragm is not particularly well seen which may be in part projectional and is unchanged from priors . Persistent minimal retrocardiac opacity . The lungs elsewhere are clear and the cardiomediastinal silhouette is stable . Dense atherosclerotic calcifications again noted at the arch . No acute osseous abnormality is detected .
    OUTPUT:
    
No definite acute cardiopulmonary process . Mild retrocardiac opacity potentially due to combination atelectasis or effusion noting that infection can not be excluded . This is similar in appearance when compared to multiple priors .