Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . A small , layering left pleural effusion is new . Lungs are grossly clear ; a healed fracture of a proximal right lower rib should not be mistaken for a lung nodule . There is no pneumothorax . Rightward deviation of the cervical trachea is chronic due to a Zenkers diverticulum of the upper esophageal sphincter or a goiter .
    OUTPUT:
    
New small left pleural effusion , but no definite pneumonia . Consider acute pulmonary embolus or left upper abdomina pathology . Chronic probable Zenkers diverticulum or left thyroid lesion .