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AJNR - American Journal of Neuroradiology

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Spontaneous Thrombosis of a Traumatic Posterior Cerebral Artery Aneurysm in a Child

Fanny Morón^a, Goetz Benndorf^a, Sergin Akpek^a, Robert Dempsy^b and Charles Milton Strother^a

^a Department of Radiology, Baylor College of Medicine, Methodist Hospital, Houston, TX
^b Department of Neurosurgery, University of Wisconsin, Madison, WI

View larger version (109K): [in a new window]   FIG 1. A, Initial CT scan. Axial CT scan shows hyperattenuated round lesion (arrows) adjacent to the left ambient cistern with slight compression of the brain stem. B, Initial arteriogram. Left vertebral arteriogram, anteroposterior view, shows a contrast medium "jet" filling (arrow) of a large aneurysm arising from the left P2 segment.

View larger version (136K): [in a new window]   FIG 2. Follow-up CT scan. Axial CT scan shows increased hyperattenuation of the lesion (arrows), indicating acute thrombosis.

View larger version (101K): [in a new window]   FIG 3. A, Follow-up axial CT scan, obtained 5 years later, demonstrating the shrinkage of the lesion associated with some calcifications. B, Follow-up MR angiogram obtained 5 years later. MR angiogram documents no recanalization of the aneurysm and partial filling of distal PCA branches.