Figure 7.

Skull base invasion of squamous cell Ca. (A) Sagittal CT image shows a hypodense soft tissue mass lesion centered in the superior nasal cavity, ethmoid, and sphenoid sinuses, which erodes the anterior skull base, sellar floor, and clivus (red arrows). (B) Sagittal noncontrast T1W, (C) coronal postcontrast CISS, (D) axial and (E) sagittal postcontrast T1W images demonstrate significant heterogeneous enhancement of the lesion with extension into the right cavernous sinus (blue arrow), prepontine cistern (black arrows), and anterior cranial fossa. (F) ADC map image shows mild restricted diffusion in the lesion, suggesting high cellularity.