This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
An 81-year-old woman presented with a 1-week history of vomiting. What is the diagnosis? 
Select and explain. 
A. Lung abscess, B. Perforated duodenal ulcer, C. Epiphrenic diverticulum, D. Paraesophageal hernia
D: Paraesophageal hernia
Answer: D: Paraesophageal hernia 
Explanation: Answer D. Paraesophageal herniaThe correct answer is paraesophageal hernia. This chest x-ray and a subsequent CT scan showed a large retrocardiac mass containing air and fluid, consistent with herniation of the stomach into the chest. Paraesophageal (or hiatal) hernias occur when the stomach protrudes through the diaphragm into the chest. Hernias are classified by the degree of migration of the gastroesophageal junction and stomach.