Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral widespread lung opacities have worsened on the left side . Right lower lung atelectasis and pleural effusion has , however , improved . There is no pneumothorax . Cardiac contour is top normal .
    OUTPUT:
    
Bilateral widespread severe lung opacities have worsened on the left side . The differential diagnosis would include ARDS , pneumonitis related to drug overdose . Superimposed infection or aspiration can not be excluded .