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AJNR - American Journal of Neuroradiology

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Persistent Stapedial Artery: MR Angiographic and CT Findings

Turgut Yilmaz^a, Cem Bilgen^b, Recep Savas^a and Hudaver Alper^a

^a Department of Radiology, Ege University Hospital, Izmir, Turkey
^b Department of Radiology and Ear, Nose, and Throat Surgery, Ege University Hospital, Izmir, Turkey

View larger version (138K): [in a new window]   FIG 1. Axial CT scan shows a normal left foramen spinosum (single white arrow) and an absent right foramen spinosum. The right ICA is laterally displaced into the middle ear (double white arrow). The left ICA is in a normal position (black arrow).

View larger version (65K): [in a new window]   FIG 2. Axial images from inferior to superior: top left, top right, bottom left, and bottom right. The facial canal (arrowhead) is enlarged in the first three images. The small vascular channel can be seen leaving the vertical aberrant segment of right ICA at the level of the stapedial crura in the last image (arrows).

View larger version (65K): [in a new window]   FIG 3. Axial images from inferior to superior: top left, top right, bottom left, and bottom right. Following the facial nerve canal (arrow in the first three images), the small vascular channel reaches the middle cranial fossa (arrow, last image). This represents the position of the geniculate ganglion turn of the facial nerve canal.

View larger version (61K): [in a new window]   FIG 4. Coronal 3D time-of-flight MR angiogram shows hypoplasia of the petrous vertical portion of the right ICA, the normal left internal carotid artery (double arrow), and the collateral supply of the right ICA.

View larger version (61K): [in a new window]   FIG 5. Axial MR angiogram shows the persistent stapedial artery arising from the aberrant ICA (arrow)

View larger version (61K): [in a new window]   FIG 6. Axial MIP MR angiogram shows hypoplasia of the right A1 segment of the anterior cerebral artery.