Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal cardiomediastinal silhouette . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . A 3 - mm nodule in the left base is unchanged since at least ___ . Note is made of indistinctness of the most posterior part of the left diaphragmatic margin on lateral view , which could be better assessed by an oblique view .
    OUTPUT:
    
No definite evidence of pneumonia . Equivocal posterior left diaphragmatic contour abnormality could be further assessed with an additional right anterior oblique view .