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AJNR - American Journal of Neuroradiology

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Otologic Manifestations of Petrous Carotid Aneurysms

Gul Moonis^a, Catherine J. Hwang^a, Tabassum Ahmed^b, John B. Weigele^a and Robert W. Hurst^a

^a Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, PA
^b Mallinkrodt Institute of Radiology, St. Louis, MO

View larger version (144K): [in a new window]   FIG 1. Case 1. Coronal CT image through the right temporal bone demonstrates an erosive lesion involving the posterior wall of the right petrous carotid canal with erosion into the cochlea (arrow).

View larger version (125K): [in a new window]   FIG 2. Case 1. Image from a right common carotid artery injection demonstrates an aneurysm of the horizontal petrous ICA segment (arrow).

View larger version (98K): [in a new window]   FIG 3. Case 2. Image from a right common carotid artery injection reveals a lobulated 3-cm aneurysm of the petrous segment of the ICA.

View larger version (50K): [in a new window]   FIG 4. Case 2. Unenhanced axial (A) and coronal (B) CT images demonstrate a large slightly hyperattenuated soft-tissue mass with smooth scalloped margins, measuring 3 cm in diameter expanding the petrous carotid canal with erosion of the medial wall of the middle ear (arrow).

View larger version (135K): [in a new window]   FIG 5. Case 3. Image from a left common carotid artery injection demonstrates a 1.2-cm maximal-diameter wide-necked fusiform aneurysm arising from the anterior curve of the petrous segment of the ICA, projecting posteromedially.