Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate low lung volumes . There is a nodular opacity in the right lung base which is worrisome for infectious process . There is no large pleural effusion . There is no pneumothorax . Cardiomediastinal silhouette is stable , cardiomegaly which is mild . There is mild central vascular engorgement with mild interstitial perihilar opacities to suggest mild edema . There is no air under the right hemidiaphragm .
    OUTPUT:
    
Stable cardiomegaly with mild interstitial pulmonary edema . Difficult to exclude superimposed right basilar pneumonia .