Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Retrocardiac opacity on the lateral view could represent atelectais or consolidation . There is no pulmonary edema , pleural effusion , or pneumothorax . Median sternotomy wires are aligned and intact . Prosthetic mitral valve projects over the heart . Aortic calcifications are noted . Otherwise , the hila and mediastinal contours are normal .
    OUTPUT:
    
Retrocardiac opacity could represent pneumonia given the patient 's clinical symptoms . Followup radiograph after treatment is recommened in 4 weeks . Moderate cardiomegaly .