Cranial bone defect with associated fluid opacification of adjacent sinus

Coronal CT image through anterior skull base (A) shows normal midline crista galli and adjacent fovea ethmoidalis. Coronal CT image (B) and magnified inset (C) show fluid-density within roof of both nasal cavities (left greater than right) (arrow). Sagittal plane-reconstruction CT image (D) and magnified inset (E) show fluid-density in anterior ethmoid sinus (arrow).