### Abstract

BACKGROUND AND PURPOSE: Although attenuated coil packing of intracranial aneurysms is an important goal of endovascular embolization, because of their small size, some aneurysms can only be treated with a single embolization coil. We retrospectively analyzed small aneurysms treated with a single Guglielmi detachable coil (GDC) to determine whether the coil-embolization ratio (CER) is predictive of embolization stability. METHODS: The CER was determined for 25 small (<7-mm diameter) intracranial aneurysms, each treated with a single embolization coil. The largest aneurysm dimension, estimated by comparison to anatomic landmarks, was used for volume calculation based on a spherical model. Coil volumes were according to manufacturer specifications. CER was calculated by the formula (coil volume/aneurysm volume) × 100%. Embolization stability was assessed by angiographic follow-up. RESULTS: The average CER for all aneurysms was 8.2% (SD, 6.5%; range, 0.6%-21.1%). Twelve percent of the aneurysms had a CER >20%. Follow-up angiographic assessment was conducted at an average of 30.8 months after initial treatment. Eighty-four percent of the aneurysms were obliterated. One large (6 × 10 mm) and 3 small (<1 mm) recurrences were identified. The average CER for unchanged aneurysms was 8.0% (SD, 5.9%) and for the recurrent aneurysms was 8.8% (SD, 8.7%), which was not statistically significant. CONCLUSION: Small aneurysms treated with a single coil achieved satisfactory stability despite having a low average packing attenuation. CER was not predictive of recurrence in small intracranial aneurysms treated with a single detachable coil.

Original language | English |
---|---|

Pages (from-to) | 1916-1920 |

Number of pages | 5 |

Journal | American Journal of Neuroradiology |

Volume | 26 |

Issue number | 8 |

State | Published - Dec 1 2005 |

## Fingerprint Dive into the research topics of 'Absent relationship between the coil-embolization ratio in small aneurysms treated with a single detachable coil and outcomes'. Together they form a unique fingerprint.

## Cite this

*American Journal of Neuroradiology*,

*26*(8), 1916-1920.