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Fig 1. A–C, A 52-year-old man (patient 2) with intermittent CSF rhinorrhea for 2 months. A coronal high-resolution bone window noncontrast CT (A) early in this series reveals a soft tissue lesion within the right olfactory cleft adjacent to an osseous defect at the cribriform plate. After intrathecal administration of contrast material (B), a small loculation of contrast material is visualized (arrow) surrounded by isoattenuation of soft tissue. Endoscopic surgery revealed an arachnoid lined pouch within the olfactory cleft (C).
