Case Report: Leiomyosarcoma of the inferior vena cava presenting as a right atrial mass: the value of multimodality imaging - Ann-Sophie Eggers; Jelena Jovanić; Stefan Pahl; Cyrill Meuwly; Bojana Ilić; Christoph Philipp Kemna; Patrick Doeblin; Stefanie Maria Werhahn; Ingo Hilgendorf; Sebastian Kelle (Frontiers in Cardiovascular Medicine, 2026)