Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a patchy right basilar opacity , which could be due to superimposed vascular structures , although a pneumonia can not be excluded . There is no pneumothorax or pleural effusion . Cardiac and mediastinal silhouette is within normal limits .
    OUTPUT:
    
Patchy right basilar opacity , likely due to superimposed vascular structures , although pneumonia can not be excluded .