Pancreatic cancer may go undetected until it's advanced. By the time symptoms occur, diagnosing pancreatic cancer is usually relatively straightforward. Unfortunately, a cure is rarely possible at that point.
(This section focuses on pancreatic adenocarcinoma, which account for more than 95% of pancreatic cancer. Other forms of pancreatic cancer are mentioned at the end.)
Lab tests may show evidence that bile flow is being blocked, or other abnormalities.
Based on a person's exam, lab tests, and description of symptoms, a doctor often orders an imaging test:
Computed tomography (CT scan): A scanner takes multiple X-ray pictures, and a computer reconstructs them into detailed images of the inside of the abdomen. A CT scan helps doctors make a pancreatic cancer diagnosis.
Ultrasound: Harmless sound waves reflected off organs in the belly create images, potentially helping doctors make a pancreatic cancer diagnosis.
Positron emission tomography (PET scan): Radioactive glucose injected into the veins is absorbed by cancer cells. PET scans may help determine the degree of pancreatic cancer spread.
If imaging studies detect a mass in the pancreas, a pancreatic cancer diagnosis is likely, but not definite. Only a biopsy -- taking actual tissue from the mass -- can diagnose pancreatic cancer. Biopsies can be performed in several ways:
Percutaneous needle biopsy: Under imaging guidance, a radiologist inserts a needle into the mass, capturing some tissue. This procedure is also called a fine needle aspiration (FNA).
Endoscopic retrograde cholangiopancreatography (ERCP): A flexible tube with a camera and other tools on its end (endoscope) is put through the mouth to the small intestine, near the pancreas. ERCP can collect images from the area, as well as take a small biopsy with a brush.
Endoscopic ultrasound: Similar to ERCP, an endoscope is placed near the pancreas. An ultrasound probe on the endoscope locates the mass, and a needle on the endoscope plucks some tissue from the mass.
Laparoscopy is a surgical procedure that uses several small incisions. Using laparoscopy, a surgeon can collect tissue for biopsy, as well as see inside the abdomen to determine if pancreatic cancer has spread. However, laparoscopy has higher risks than other biopsy approaches.
If pancreatic cancer seems very likely, and the tumor appears removable by surgery, doctors may recommend surgery without a biopsy.