Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal images of the chest demonstrate well - expanded lungs which are clear . There is a left - sided pleural effusion . There is no effusion on the right . There is no pneumothorax . Cardiomediastinal silhouette is unremarkable . Sternotomy wires and mitral valve ring again noted . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Left pleural effusion . Otherwise , unremarkable chest x-ray .