Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate clear lungs and normal hilar and cardiomediastinal contours . A trace left pleural effusion is seen only on the lateral view . There is no pneumothorax and pulmonary vascularity is normal . Bowel gas pattern in the upper abdomen is nonspecific . There is no evidence of pneumoperitoneum .
    OUTPUT:
    
Trace left pleural effusion without acute parenchymal abnormality .