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Fig 4. A–D, An 18-year-old man with 1 episode of CSF rhinorrhea (patient 22). CT images depict arachnoid pits lateral to sphenoid sinus and osseous erosion lateral to the foramen rotundum (short arrow). The coronal T2-weighted image (C) reveals a CSF-filled pouch extending into the right inferolateral recess with some arachnoid strands (arrow). The endoscopic image (D, view from medial) depicts an arachnoid pouch (arrow) bulging into the sinus lumen.
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