Liver cancer, liver metastases are the most common malignant liver tumor, liver metastasis in colorectal cancer by hepatic artery infusion chemotherapy and embolization or surgical resection or chemotherapy the average survival period of up to 10-11 months. The clinical symptoms of liver metastases is more hidden, when abnormal liver function or clinical abdominal pain, fatigue, loss of appetite, abdominal mass, such as when symptoms or signs are already more advanced. More commonly in the tumor re-staging (restaging) Imageology check when he discovered that the Imageology liver metastases and hepatocellular carcinoma is similar to Inspection, Imageology were mixed, the performance of many benign lesions can Imageology metastases is similar. Sometimes in the same patient can have metastases, but also exist other benign lesions. How best to provide accurate diagnostic information for clinicians to develop the best treatment, is a radiologist challenges.
B-scan: liver metastases the most common sign is a single or multiple hypoechoic masses, but also have high or low echo halo of varying thickness to form a "bull's-eye sign" or was mixed echo. A wide range of small hypoechoic lesions can form porous membership changes. Sometimes the echo of the liver uneven edge of tumor more than vague. Metastatic calcification with acoustic shadow can be displayed. Tumor necrosis sometimes can present a large surface to smooth muscle sarcoma, or metastatic renal cell carcinoma occurs most frequently in this sign.
CT scan: CT scan, the liver metastases mostly single or multiple or other low-density mass, cancer of the liver metastases can have calcification. Common primary cancer was colon cancer, ovarian cancer, lung cancer, breast cancer, thyroid cancer, malignant teratoma and so on. Enhanced CT scan findings and blood supply of metastatic tumor, and scan time, injection speed. Blood supply of liver metastases of high common in renal cell carcinoma, islet cell tumor, carcinoid, malignant tumors and other endocrine teratogenic tumor, but most of the blood supply of liver metastases is low, enhanced scan showed a low density. Tumor margins more blurred. The primary tumor was cystic persons, such as ovarian cystadenocarcinoma, cystic adenocarcinoma of the liver metastases can be cystic, but the wall more than a nodule, cyst density is higher. B-help verify the above signs, you can display a mural nodule and cyst-like echo spots.
MRI: liver metastasis Tl and T2 relaxation time were longer, Tl-weighted low signal intensity as the mostly; T2-weighted image showed intermediate signal on, signal uneven, may assume the target ring, irregular or high signal halo, this is due to peritumoral edema.
FreT2 such reports with superparamagnetic iron oxide contrast agent enhanced, the detection rate of metastases than enhanced CT scan can be increased by 36%, compared with MRI of the SE, by 19%.
Metastases in the liver angiography for the most common substance of nodular tumor stain, the surrounding high density, low density center, was double-loop video. Cancer patients with chemotherapy drugs often appear diffuse fatty liver, then liver echo B-scan see diffuse increased attenuation significantly, it is difficult to observe the deep liver. Fatty infiltration of the liver can be uneven, CT scan of the liver in general reduce the density within a relatively high density of the island of non-involved area (focal sparing areas, skip areas), and more in the gallbladder fossa! Can crack near the left lobe of the liver segment before the copies can be round or strip shape, sizes, and more difficult to identify metastases. MRI of the SE pulse sequence is not sensitive to the fatty liver, fatty liver and normal liver signal intensity of fat and muscle tissue in between, there is no obvious contrast. Scan sequences with chemical shift of water and help to identify the enzyme glycerol three signals. Enhanced CT is also helpful in demonstrating liver metastases. SE T2-weighted scan sequence signal as metastatic tumors should be increased.
Selective hepatic angiography or radionuclide scan were normal fatty liver should be considered. Metastatic tumors were shown as cold zone radionuclide scanning, angiography shows abnormal tumor blood vessels.
Liver tumors. Of diffuse fatty liver cancer patients, B ultrasound and CT scan can not be sure whether there should be options for metastatic tumor scintigraphy or MRI.