Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal upright and lateral chest radiograph demonstrates intact median sternotomy wires and prosthetic mitral valve . Lungs are slightly hypoinflated with bilateral perihilar interstitial opacities . No focal opacity . Small amount of fluid is noted within the minor fissure . A small right pleural effusion is present consistent with a subpulmonic effusion . No left pleural effusion . No pneumothorax . Eventration of the right hemidiaphragm is noted . Moderate cardiomegaly noted . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of the osseous structures are unremarkable and visualized upper abdomen is within normal limits .
    OUTPUT:
    
Mild vascular congestion with small right subpulmonic effusion and moderate cardiomegaly .