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Fig 2. A, On the axial HRCT image of the left temporal bone in case 2, a defect is seen at the posterior surface of the left temporal bone (black arrow), with a normal endolymphatic duct (arrowhead). Note the presence of a hypoattenuated otospongiotic focus in the fissula antefenestram region (white arrow).
B, The axial 0.4-mm-thick T2-weighted image again demonstrates the arachnoid granulation (arrow). It has the same signal intensity as CSF.
C, The axial 0.8-mm-thick T1-weighted image after intravenous administration of gadolinium shows a hypointense nonenhancing arachnoid granulation (arrows).
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