Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable , with moderate cardiomegaly . Multiple intact sternotomy wires , mediastinal surgical clips , and prosthetic aortic valve are noted . There is minimal improvement in a chronic moderate - sized left pleural effusion . No pneumothorax is seen . Faint opacity right base laterally appears to represent residua from ___ xray . Bibasal opacities , left greater than right , likely represents atelectasis . Ppossible background chronic lung disease . Faint opacity over left upper quadrant of abdomen may represent residual contrast in te stomach . No free air seen beneath the diaphragm . No obvious displaced rib fractures are seen . If there is a high clinical concern for a nondisplaced rib fracture , dedicated rib series scan be performed with a marker placed at the site of maximum tenderness .
    OUTPUT:
    
Stable chronic cardiomegaly . Mild improvement in the chronic moderate - sized left pleural effusion and left basal atelectasis .