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

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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.
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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.