A surgical case of delayed coil migration after balloon-assisted embolization of an intracranial broad-neck aneurysm: case report.

BACKGROUND AND IMPORTANCE: Balloon-assisted coil placement is an important technique for coil embolization of broad-neck aneurysms. With this technique, we can prevent coil migration into a parent artery during a procedure. Complications of intraprocedural coil migration have been reported in the literature. However, delayed coil migration is extremely rare. We present a case of delayed coil migration after balloon-assisted coil embolization and describe our management of this complication. CLINICAL PRESENTATION: A 59-year-old man presented with hypertension and a tension headache. Clinical evaluation incidentally discovered an unruptured broad-neck aneurysm at the left internal carotid bifurcation. Endovascular embolization of the aneurysm was performed with a balloon-assisted technique. The patient had a transient ischemic attack, and a skull radiograph showed coil migration 3 months after the procedure. We performed an operation to remove the coils and to clip the aneurysm with superficial temporal artery and middle cerebral artery bypass. The patient was discharged without neurological deficit. CONCLUSION: This is a rare case in which delayed coil migration into the parent artery occurred after balloon-assisted coil embolization, highlighting the importance of surgical management of delayed coil migration.