fig 3.

Patient with a bone defect revealed by CT and a leak evident by CT cisternography but not by radionuclide cisternography.

A, Coronal CT scan of the face shows a large defect (straight arrow) in the right cribriform plate with adjacent mucosal thickening. Nasal pledgets can be seen within the nasal cavity (curved arrow).

B, Coronal CT cisternogram of the same region shows accumulation of contrast medium at the defect and extending into the ethmoidal sinus (arrow). The results of radionuclide cisternography and nasal pledgets were normal. There was no surgical confirmation.