Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs . Severe cardiomegaly includes marked dilatation of the left atrium . There is no pulmonary edema , pleural effusion , or pneumothorax . Lungs are clear .
    OUTPUT:
    
Severe cardiomegaly , no evidence of pulmonary edema .