Covidien received information from a clinical study that a patient underwent onyx embolization treatment for intracranial non-cavernous dural arteriovenous fistulas.During the procedure, it was reported the echelon catheter tip became stuck in the patient and was left there.One month later, it was reported the patient had retromastoid left sided tiny tinnitus.The event was considered mild in severity and the patient recovered without sequelae.No further information was reported as a result of the procedure.
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