**Question:** Most common complication of Whipple's procedure is:

A. Pancreatic fistula
B. Bile leak
C. Infection
D. Delayed gastric emptying

**Core Concept:** Whipple's procedure, also known as pancreaticoduodenectomy, is a surgical procedure used to treat malignant tumors involving the head of the pancreas, duodenum, and ampulla of Vater. It involves removing the affected portion of the pancreas, duodenum, and bile duct, along with part of the stomach and surrounding lymph nodes. The procedure is named after the surgeon who first described it, Harry Whipple.

**Why the Correct Answer is Right:** The most common complication after Whipple's procedure is pancreatic fistula (A). A pancreatic fistula is an abnormal communication between the pancreatic duct and the surrounding tissues or the gastrointestinal tract. This can lead to leakage of pancreatic enzymes and fluid into the abdominal cavity, causing pain, fever, and the formation of an abdominal collection called a pseudocyst.

**Why Each Wrong Option is Incorrect:**

B. Bile leak (B) is another potential complication of Whipple's procedure, but it is less common compared to pancreatic fistula. Bile leak occurs when the bile duct is inadvertently cut or injured during surgery, causing leakage of bile into the abdominal cavity.

C. Infection (C) is a possible complication of any surgical procedure, but the focus of this question is on the most common complication of Whipple's procedure.

D. Delayed gastric emptying (D) is a less common complication that can occur after Whipple's procedure due to the disruption of the normal anatomy and physiology of the gastrointestinal tract. However, it is less common than pancreatic fistula and bile leak.

**Clinical Pearls:**

1. Whipple's procedure is a complex and invasive surgical procedure with potential complications.
2. Early recognition and management of complications are crucial to improve patient outcomes and reduce morbidity and mortality.
3. Post-operative pancreatic fistula is the most common complication, followed by bile leak. Infection and delayed gastric emptying are less common but still important to be aware of.
4. To minimize the risk of complications, surgeons must meticulously handle the pancreatic and biliary ducts during surgery, as well as ensure proper reconstruction of the gastrointestinal tract.