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Fig 1. Aneurysm outcome grading scheme. A, Grade 1 "Obliterated" aneurysms had no contrast filling within the interstices of the coils or at the neck and were considered completely obliterated. B, Grade 2 "Neck Remnant" was used to classify cases with contrast filling at the base of the aneurysm within the neck or within an area subjacent to the main coil mass, but not at the actual neck. C, Grade 3 "Residual" or "Recurrent" was used if there was contrast filling within the interstices of the coil, or more contrast filling than simply at the neck, because of expansion of the aneurysm or compaction of the coil, depending on whether it was present immediately after the treatment ("Residual") or at follow-up ("Recurrent").
