Side-Branch Embolization Before 90Y Radioembolization: Rate of Recanalization and New Collateral Development

OBJECTIVE. The purpose of this study was to assess the rate of recanalization and collateral vessel formation after side-branch embolization during mapping angiography for planned 90Y radioembolization. MATERIALS AND METHODS. Patients who underwent side-branch embolization at mapping angiography before 90Y administration were included. Embolized vessels included the gastroduodenal artery, right gastric artery, and accessory arteries. Four interventional radiologists reviewed follow-up angiograms to assess recanalization and new collateral formation of embolized vessels. The time to recanalization or new collateral formation was tracked within 60 days and after the final arteriographic study. Differences in outcome among patients who had and those who had not undergone previous arterial directed therapy were reviewed. RESULTS. Fifty-six patients underwent side-branch embolization and follow-up arteriography; 124 treatments were performed after side-branch embolization (median, 2; range, 1–7), and the media...