Abstract
BACKGROUND: Hepatocellular carcinoma (HCC) accompanied by portal vein tumour thrombus (PVTT) presents an aggressive disease course, worsening liver function reserve, and a high recurrence rate. Clinical practice guidelines recommend systemic therapy as the first-line option for HCC with portal invasion. However, to achieve longer survival in these patients, the treatment strategy should be concluded with removal of the tumour by locoregional therapy. We experienced a case of initially unresectable HCC with main PVTT converted to radical hepatectomy after lenvatinib treatment. CASE SUMMARY: A 59-year-old male with chronic hepatitis C infection visited our clinic as a regular post-surgery follow-up. Contrast-enhanced abdominal computed tomography revealed a liver mass diffusely located at the lateral segment with a massive PVTT extending from the umbilical portion to the main and contralateral third-order portal branches. With the diagnosis of unresectable HCC with Vp4 (main trunk/contralateral branch) PVTT, lenvatinib was started at 12 mg/d. The computed tomography taken 3 mo after starting lenvatinib showed regression of the PVTT, which had retreated to the contralateral first-order portal branch. He tolerated the full dose without major adverse effects. With cessation of lenvatinib for 7 d, radical left lobectomy and PVTT thrombectomy were conducted. The patient's postoperative course was uneventful. Microscopically, the primary lesion showed fibrotic changes, with moderately to poorly differentiated tumour cells surrounded by granulation tissues in some areas. The majority of the PVTT showed necrosis. He was alive without recurrence for 8 mo. CONCLUSION: This is the first case of HCC with Vp4 PVTT in which radical conversion hepatectomy was succeeded after lenvatinib treatment.