Abstract:Objective: To investigate the value of contrast-enhanced ultrasound (CEUS) in the differential diagnosis of benign and malignant lesions.Methods: the results of contrast-enhanced ultrasound (CEUS) in 53 patients with lower biliary obstruction were analyzed retrospectively, and compared with pathological diagnosis, To investigate the coincidence rate and the specificity and sensitivity of contrast-enhanced ultrasonography in qualitative diagnosis of low biliary obstruction