Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are intact and the mitral and tricuspid prosthetic valves are unchanged . The cardiomediastinal and hilar contours are stable . The lungs are clear . Small bilateral pleural effusions with minimal associated atelectasis are present .
    OUTPUT:
    
Unchanged small bilateral pleural effusions with associated atelectasis but no evidence of pneumonia or heart failure .