CT of inspissated mucus in chronic sinusitis.

However, our search of the literature failed to disclose any report of FMD associated with fenestration of the cervicocephalic arteries; therefore, it is presumed that the association observed in the present patient was incidental. The clinical significance of fenestration of the vertebral artery has not been determined. An aneurysm susceptible to rupture may arise in the proximal portion of the fenestration as in the basilar, internal carotid, or intracranial arteries [5-7). Fenestration without an aneurysm is probably innocuous, although fenestration may become a nidus for clot formation [2).