[Rotational vertebro-basilar insufficiency secondary to a fibrous band of the longus colli muscle: value of CT spiral angiography diagnosis].

The authors report a case of rotational vertebro-basilar insufficiency causing "drop-attacks". To our knowledge, it is the first case of extraluminal vertebral artery compression caused by a fibrous band of the longus colli muscle, demonstrated by spiral computed tomographic angiography with volume rendering reformation.