Retrieval of Migrated Coils Using Stent Retrievers During Aneurysm Coiling: A Case Series and Literature Review

Background— Coil migration is a recognized complication during endovascular embolization of intracranial
saccular aneurysms and can cause parent artery occlusion and ischemic stroke. There is no established technique or
specifically designed rescue device to retrieve displaced or migrated coils.
Methods— Case series and literature review. We performed a literature review using keywords migrated coil, coil
migration, coil retrieval, endovascular retrieval, displaced coil, and fractured coil on PubMed central (PMC).
Case Description— We report two cases describing off label use of a stent retriever (Trevo®; Stryker®, Fremont
CA, USA) to retrieve migrated coils from the right internal carotid and right middle cerebral arteries after other re
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trieval devices had failed. The literature review identified 31 cases of coil migration.
Conclusions— We observed that stent retrievers can be used as a rescue device for migrated or fractured coils
causing flow limiting occlusion.