Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Status post sternotomy as before . Again identified are the tiny metallic circular structures in the aortic valve area indicative of Medtronics valve prosthesis placement . Position is unchanged . Heart size and configuration has not undergone any significant interval change . As before , a few mitral ring calcifications are identified demonstrating also a mild enlargement of the left ventricular contour posteriorly . The thoracic aorta is moderately widened and elongated but no local contour abnormalities are present . The pulmonary vasculature is not congested . There exist bilateral peripheral pleural scar formations with mild blunting of the lateral and posterior pleural sinuses probably representing post-operative changes . No evidence of any new acute parenchymal infiltrate and no evidence of increasing CHF . The apical area is clear on the frontal view excluding the possibility of any pneumothorax .
    OUTPUT:
    
Stable chest findings . No radiographic evidence of increasing pulmonary congestion or acute infiltrates during the last five - month examination interval .