Endovascular therapy for cerebral arteriovenous malformations, although generally accepted to be a safe procedure, is not without risks. We present a patient with a 20 cm free segment of a catheter in the anterior circulation as a complication of embolization. This is a very rare complication. To our knowledge, only six cases have been reported in the literature. We believe this to be the first reported case of this complication treated surgically via craniotomy and arteriotomy.