Abstract: Objective  To explore the diagnostic value of contrast-enhanced ultrasonography (CEUS) in liver cancer and the evaluation value of residual cancer after TACE treatment. 
Methods  A total of 76 patients with suspected primary liver cancer were selected as study subjects for digital subtraction angiography(DSA) examination and clinical diagnosis. The sensitivity and specificity of routine ultrasound and CEUS in the diagnosis of liver cancer were observed with DSA as the gold standard, and their postoperative residual cancer evaluation was analyzed. 
Results  In this study, 64 patients with single lesions and 5 patients with no liver cancer lesions were included; 50 cases were positive and 2 cases were negative in routine ultrasound examination, while 61 cases were positive and 5 cases were negative in CEUS. The sensitivity, specificity and diagnostic coincidence rate of CEUS diagnosis were significantly higher than those of routine ultrasound(P＜0.05). There were 58 signs of residual activity after TACE operation, 6 cases of complete inactivated. Among them, 44 liver cancer lesions were positive and 1 case was negative in routine ultrasound examination; 55 liver cancer lesions were positive and 4 cases were negative in CEUS. The sensitivity, specificity and diagnostic coincidence rate  of CEUS were significantly higher than those of routine ultrasound(P＜0.05). 
Conclusion  CEUS for primary liver cancer can improve the diagnostic coincidence rate of lesions and improve the quality of residual cancer detection after TACE operation, which is therefore worthy of popularization in relevant clinical diagnosis and postoperative evaluation. 

Key words: liver neoplasms, ultrasonography, diagnosis