Fig 2. A, B, Sagittal high-resolution bone window image depicts a 2-mm defect within the cribriform plate (arrow) in a 30-year-old patient with 4 months of intermittent CSF rhinorrhea (patient 8). The coronal T2-weighted image reveals a normal olfactory cleft. Isointense arachnoid tissue and CSF loculation originate from the junction of the cribriform plate and lamella lateralis and herniate into the frontal recess (long arrow) down to the middle meatus (long arrow). Proximity of the osteodural defect to the entrance point of the ethmoid artery is shown (short arrow).