Fig. 1

Preoperative CT and MRI. A Axial CT image without contrast demonstrates an ill-defined mass (white arrow) in the sphenoid sinus and clivus eroding the adjacent bone. B Sagittal CT image displays the relationship between the mass (white arrow) and adjacent structures. C-F The mass (white arrow) presents as low to high signal on T1-weighted and T2-weighted images with slightly diffusion restriction and vessels involvement. G-H The mass (white arrow) was outside the sellar without a direct connection to the normal pituitary tissue (red arrow)