Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest . Exam is limited secondary to technique and respiratory motion . Linear opacity at the right lung base medially may be due to atelectasis . Cardiac silhouette is slightly enlarged but not significantly changed . No acute osseous abnormalities detected .
    OUTPUT:
    
No definite acute cardiopulmonary process based on this limited exam .