Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded . A rounded contour in the anterior cardiophrenic recess seen only on the lateral view is probably a mediastinal fat collection or small Morgagni hernia . No additional focal opacity . No pleural effusion or pneumothorax . No pneumomediastinum . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
Rounded contour in the anterior cardiophrenic recess only seen on lateral projection is a mediastinal fat collection or small Morgagni hernia . .