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AJNR - American Journal of Neuroradiology

Published ahead of print on July 10, 2008
doi: 10.3174/ajnr.A1214

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Prevalence and Appearance of the Posterior Wall Defects of the Temporal Bone Caused by Presumed Arachnoid Granulations and Their Clinical Significance: CT Findings

M.H. Lee^a, H.-J. Kim^a, I.H. Lee^a, S.T. Kim^a, P. Jeon^a and K.H. Kim^a

^a From the Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

View larger version (107K): [in this window] [in a new window]   Fig 1. Subject 24. Axial CT scan at the level of the common crus (black arrow) shows a small bone defect caused by presumed AG (white arrow), located at the lateral third of the posterior wall of left temporal bone. Although a focal loss of the posterior wall of the mastoid air cells is also present, there is no evidence of tympanomastoid opacification. This 66-year-old woman presented with hemifacial spasm, and there was no clinical feature suggesting CSF leakage.

View larger version (101K): [in this window] [in a new window]   Fig 2. Subject 4. Axial CT scan at the level of the common crus (black arrow) shows a large bone defect caused by presumed AG (white arrow), located at the lateral third of the posterior wall of the left temporal bone. There also is a loss of the posterior wall of the mastoid air cells, which are opacified with fluid. This 41-year-old man presented with CSF otorrhea and recurrent septic meningitis. He underwent dural repair via intact canal wall mastoidectomy. Also noted is a small bone defect caused by presumed AG (arrowhead), located at the lateral third of the posterior wall of right temporal bone.