An x-ray may be helpful in the diagnosis of a hiatus hernia. Findings on an x-ray suggestive of a hiatus hernia include retrocardiac opacity with the air-fluid level.

• An x-ray may be helpful in the diagnosis of a hiatus hernia. Findings on an x-ray suggestive hiatus hernia include:^[1][2]
  • An upright radiograph of chest in patients with paraesophageal hernias reveals retro-cardiac air-fluid level 

• 
  Ches X-ray: A Hiatal hernia- Frontal view Air-fluid level behind the heart on the lateral radiograph. Source:Case courtesy of Dr Andrew Lawson, Radiopaedia.org, rID: 25499^{_Radiology_Case_|_Radiopaedia.org-3|[3]}