Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A 1 .5 cm well - defined rounded nodule is seen abutting but not obscuring the right mediastinal margin at the level of the right hilum . Nodular opacities seen above the right cardiophrenic angle correlate with a retrocardiac opacity in the lateral view . There is no pleural effusion or pneumothorax . No cardiomegaly .
    OUTPUT:
    
Well - defined 1 .5 cm nodule abutting but not obscuring the right mediastinal margin is of unclear etiology and no comparison study is available . Further assessment with CT chest is recommended . Nodular and patchy retrocardiac opacity just superior to the right cardiophrenic angle may represent pneumonia and can be assessed with the CT .