Retraction Note to: Updates Surg (2014) 66:135–143 DOI 10.1007/s13304-014-0251-6

The article has been retracted upon request of the authors as it contains similarities with paragraphs of a previously published article, “Contrast-enhanced ultrasound of intrahepatic cholangiocarcinoma: correlation with pathological examination. H.-X. Xu et al. Br J Radiol 85:1029–1037 (2012)”.