<prompt> Retrocardiac lucency with air-fluid level is seen inHiatus herniaDistal end esophageal obstructionEventration of diaphragmZenkers diveiculum  <response>: The gastric fundus when displaced above the diaphragm, presents as a retrocardiac mass on a chest radiograph. The presence of an air-fluid level in the mass suggests the diagnosis. ref - Harrisons internal medicine 20e pg 2211 