CT diagnosis of colon cancer
Spiral CT is currently the most widely used, can be more accurate display of extrahepatic metastatic liver lesions between adjacent vascular or biliary tract, colorectal cancer is considered to assess the anatomy of the liver metastases and whether the best way to surgery.
CT diagnosis of colon cancer: CT arterial portography (CT arterial portography, CTAP) on liver metastasis of colorectal cancer is very sensitive to determine, is to determine the number of the gold standard of liver lesions. CTAP preserved at the top of the liver is better than ultrasound detection of small lesions. CTAP is through the superior mesenteric artery injection of contrast agents, contrast agents quick access to the portal vein system, because the node cancer liver metastases is mainly hepatic artery, rarely from the portal vein blood supply, so CTAP lesions appear as filling defect, surrounded by around High blood of the liver parenchyma. CT hepatic artery imaging (CT hepatic arteriography, CTHA) on the show hypervascular liver metastasis effects are good. CTAP is through the femoral artery to the superior mesenteric artery,
CT diagnosis of colon cancer: contrast medium injected via the catheter underwent CT scan 25 seconds; CTHA is through the femoral artery to the hepatic artery, 5 seconds after injection of contrast agent scan the left or the right hepatic artery selectively imaging. CTAP and CTHA drawback is invasive, expensive, generally do not check for colorectal cancer liver metastases conventional means. CTAP and CTHA showed liver metastasis when the right front A. CTAP scan shows lesion (M) within the perfusion defect, the rest of the liver developing uniform B. CTHA scan shows well-enhanced liver cancer.
- strengths and weaknesses of CT colonoscopy when diagnosing bowel cancer