Cranial cerebrospinal fluid leak with osseous defect on CT cisternography

CT cisternography with coronal image through anterior skull base (A) and magnified inset (B) show faintly-radiodense contrast in both ethmoid sinuses (arrows). CT cisternography with coronal image at level of sphenoid sinus (C) and magnified inset (D) show leak of radiodense contrast through osseous defect along inferior wall of right sphenoid sinus (arrow). Sagittal-reconstructed image with neck extended (E) shows contrast in sphenoid sinus (arrow).