Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study the endotracheal tube is been removed . Heterogeneous bilateral opacities predominantly at the lung bases , are essentially unchanged ___ . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Unchanged bilateral parenchymal opacities since ___ , concerning for multifocal pneumonia or aspiration . Consider opportunistic infection given the atypical appearance .