Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a dense retrocardiac consolidation consistent with left lower lobe pneumonia . A small left pleural effusion is also seen . There is stable cardiomediastinal silhouette demonstrating mild cardiomegaly and a tortuous aorta . There are no masses , lesions , or pneumothorax . Pleural surfaces are unremarkable . There is cardiomegaly with no evidence of pulmonary edema or failure .
    OUTPUT:
    
Left lower lobe pneumonia .