Background: Intraoperative ultrasound (IOUS) offers an accurate staging of hepatic disease in patients with liver malignancies but its role in patients with intrahepatic cholangiocarcinoma (IHC) has been poorly evaluated. Aim of the study was to assess the impact of IOUS staging for IHC. Methods: Data from a prospectively collected database of patients with IHC were retrospectively analyzed. All patients scheduled for liver resection were considered for the study. Performance of intraoperative ultrasound staging (both open and laparoscopic) was evaluated. Results: From January 2000 to December 2020 175 patients with IHC were scheduled for hepatectomy. 14 (8%) were considered unresectable at staging laparoscopy: 9 because of peritoneal carcinomatosis and 5 owing to laparoscopic ultrasound (LUS) findings. 161 liver resections were performed. 183 lesions suspected for IHC were preoperatively detected. All patients were staged by thoracoabdominal CT. MRI and PET-CT were also performed in 99 (61.5%) and 51(31.6%) cases respectively. In 22 patients IHC was misdiagnosed (i.e. colorectal metastases or HCC, etc.) at preoperative imaging as well in 12 patients at IOUS. Concordance rate of preoperative diagnosis with IOUS was 93%. Intraoperatively, 34 nodules were newly detected by IOUS in 20 patients (12.4%). 30 were confirmed IHC at pathological examination. The median diameter of new nodules was 5mm (4-8). IOUS also found satellite nodules in 19 patients (12%). Vascular relationships were modified in 14 patients compared to preoperative imaging modalities. Surgical plan was changed according to IOUS or LUS findings in 33(20.5%) cases. Time to first recurrence was worse in patient with new IHC (4 vs 11.6 months, p<0.001). Conclusion: IOUS is mandatory for a correct staging in patients undergoing resection for IHC allowing intraoperative characterization of significant prognostic factors.
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