In June, 2008, a 44-year-old immunocompetent man presented to us with sinusitis associated with headache, transient diplopia, and dizziness. He had a 7-year history of chronic sinusitis occasionally treated with pseudoephedrine and antibiotics. CT of the sinuses showed opacification of the paranasal sinuses which were filled with high density material, erosion of the sphenoid bone, and propagation of the pathological process to the sellar region, with a large sellar mass (figure A). MRI confirmed...