Further, lymphoma size reduced after the induction of CAR-T cell therapy, and tumor regrowth was not noted at 3 months after CAR-T cell infusion.<h4>Conclusion</h4>Interleukin-6 pathway inhibitors and corticosteroid therapy should be considered in the context of CRS for significant pericardial effusion after CAR-T cell therapy in the acute phase. Here, IL6 is linked to pericardial effusion.