Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . Slight hyperlucency of lower lobes may be related to history of alpha - 1 - antitrypsin deficiency with basilar predominant emphysema , this is not definitively diagnosed radiographically . Lungs are free of consolidation or substantial atelectasis , and there are no pleural effusions or acute skeletal findings . Apparent saber - sheath configuration of the trachea is present with narrowed intrathoracic coronal dimension compared to the sagittal dimension , a finding frequently associated with COPD . In the imaged portion of the upper abdomen , prominence of the splenic contour is noted as well as a diffuse haziness , likely corresponding to ascites as revealed on recent ___ MR of the abdomen .
    OUTPUT:
    
No radiographic evidence of pneumonia .