GI Cancer Diagnostics. The Wilmot Cancer Center provides the widest range of diagnostic tools in the region for patients with gastrointestinal (GI) cancer. Barium enema. Provides an x-ray image of the colon to reveal its structure and any abnormalities. Biopsies. A sampling of cells from a particular organ that is examined by a pathologist. Cholangiogram. Examines the bile ducts for evidence of cancer. Colonoscopy. Examines the colon and rectum for cancer. Also reveals polyps that pose a cancer risk. CT scan. Uses x-rays to create detailed cross-sectional images of a part of the body. Fine needle aspiration. A thin needle is inserted into an organ to remove a few cells for further examination. Exploratory surgery. Surgery that is used to locate and diagnose cancer. MRI. Imaging technology that uses a powerful magnet to provide detailed images of part of the body. PET scan. A 3-D imaging technology that can show how a particular organ is functioning. Sigmoidoscopy. Provides images of the last few inches of the colon. Spyglass Direct Visualization System. Provides highly detailed images of tiny parts of the body, helping to detect cancers without the need for a biopsy. Ultrasound. Utilizes sound waves to provide images of various organs of the body. Upper endoscopy. Examines the esophagus and stomach with a tiny camera that is passed down your throat while you are under anesthesia.