**Core Concept**
The patient's symptoms and abdominal X-ray findings suggest acute pancreatitis, a serious condition where the pancreas becomes inflamed. This can be caused by gallstones (cholelithiasis) or excessive alcohol consumption, among other factors.

**Why the Correct Answer is Right**
The patient's severe epigastric pain radiating to the back is a classic symptom of acute pancreatitis. The abdominal X-ray may show a "colon cut-off sign," which is a characteristic finding in this condition. The "colon cut-off sign" is due to the edema and inflammation of the pancreas, which causes the colon to appear cut off or truncated on the X-ray.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not describe a specific radiological finding that is associated with acute pancreatitis.
**Option B:** This option is incorrect as it does not accurately describe the abdominal X-ray findings in acute pancreatitis.
**Option C:** This option is incorrect as it does not correlate with the patient's symptoms and X-ray findings.

**Clinical Pearl / High-Yield Fact**
The "colon cut-off sign" is a valuable radiological finding that can suggest acute pancreatitis, especially in patients with a history of gallstones or excessive alcohol consumption.

**Correct Answer: D.**