Ultrasonographic studies were performed on 502 cases with malignant tumors in the liver. We analyzed the ultrasonographic characteristics of the cases: comparing hepatocellular carcinoma (HCC) with metastatic tumor, different sizes of HCC and metastatic tumors, and the internal echo levels of various metastatic tumors. The conclusions are described below.
1. The majority of tumors showed a round shape, smooth boundaries, thin marginal hypoechoic zone, no enhanced or attenuated posterior echo, or lateral shadows. The internal echo levels were varied; 37.5% hyperechoic, 13.5% isoechoic, 27.9% hypoechoic and 21.1% were heterogenous.
2. The most noticeable difference between HCC and metastatic tumor was the internal echo level. The metastatic tumor appeared hyperechoic more frequently than HCC. In metastatic tumors, 46.7% were hyperechoic and ll.6% were heterogenous. In HCC, 26.1% and 32.7% respectively.
3. As the size of HCC became bigger, the tumor appeared more heterogenous. Metastatic tumor appeared more hyperechoic as the tumor grew.
4. The majority of metastatic tumors from stomach, colon, rectum, biliary tract, lung and kidney appeared hyperechoic. Tumors from esophagus, breast, pancreas and smooth muscle appeared more hypoechoic.
5. The internal echo level of some metastatic tumors changed when the tumor grew bigger. The internal echo of the other tumors were unchanged.