Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Projecting over the anterior aspect of the ___ right rib along the midclavicular line in the right upper lung is an ill - defined heterogenous opacity approximately 2 .1 x 3 .0 cm , more readily visible now than it was on ___ . The lungs are otherwise clear . Cardiomediastinal silhouette is normal . Pleural surfaces are unremarkable . Adenopathy is not appreciated on this study .
    OUTPUT:
    
Likely , small , right upper lung pneumonia .