Resumen: Contrast cavography during removal of a vena cava filter in pa- tients treated via thrombectomy for pulmonary embolism is a widely performed procedure, which may involve potentially serious com- plications if the human factor fails. Accidental injection of hydrogen peroxide (H2O2) after mistaking it for contrast material can have fatal consequences. We present the case of a patient who was acciden- tally injected with a high quantity of hydrogen peroxide. The prepa- ration of a preoperative checklist, the amount of H202 injected and the operator’s skill in aspirating the substance are decisive factors in avoiding such complications. Idioma: Inglés DOI: 10.52768/2766-7820/1599 Año: 2022 Publicado en: Journal of Clinical Images and Medical Case Reports 3, 1 (2022), 1599-1602 ISSN: 2766-7820 Tipo y forma: Artículo (Versión definitiva) Área (Departamento): Área Radiol. y Medicina Física (Dpto. Microb.Ped.Radio.Sal.Pú.) Área (Departamento): Área Medicina y Cirugía Animal (Dpto. Patología Animal)