 In the case of paranasal sinus/nasal cavity tumors (benign or cancerous), an otolaryngologist can perform FESS to remove the growths, sometimes with the help of a neurosurgeon, depending on the extent of the tumor.In some cases, a graft of bone or skin is placed by FESS to repair damages by the tumor.In the thyroid disorder known as Graves Ophthalmopathy, inflammation and fat accumulation in the orbitonasal region cause severe proptosis.