Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity at the right base . The lungs are otherwise clear . There is likely a small right pleural effusions . There is no left pleural effusion . There is no pulmonary edema or pneumothorax . The cardiomediastinal silhouette is mildly enlarged . Incidentally noted is a total right shoulder arthroplasty , unchanged from prior exams .
    OUTPUT:
    
Right lower lobe pneumonia and probable small right pleural effusion .