Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart and mediastinal contours are largely obscured by diffuse pulmonary opacities . The costophrenic angles appear sharp likely signifying no pleural effusion and there is no pneumothorax .
    OUTPUT:
    
Widespread pulmonary opacities , the differential for which includes edema , multifocal pneumonia , or crack lung .