title: Primary enlarged "empty" sella.
mesh_terms: D001099:Arachnoid; D001927:Brain Diseases / Q000145:classification / Q000175:diagnosis / Q000000981:diagnostic imaging; D002555:Cerebrospinal Fluid; D003560:Cysts / Q000145:classification / Q000175:diagnosis / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010911:Pituitary Neoplasms / Q000175:diagnosis; D011011:Pneumoencephalography; D011877:Radionuclide Imaging; D012658:Sella Turcica; D013346:Subarachnoid Space; D014054:Tomography