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Patient 5. CT and endoscopy are concordant. Coronal (A) and oblique sagittal (B) MPR images generated from a 0.625-mm axial dataset demonstrate a 6-mm defect in a pneumatized pterygoid recess of the left sphenoid bone. There is mucosal thickening and an air-fluid level was present (other images) in the sphenoid sinus. At endoscopy, CSF was actively leaking at this site and the maximum size of the skull base defect (anteroposterior dimension), was identical to the CT measurement (6 mm).
