hey
MoAlpha
2yr old male neutered schnauzer mix with a 1 month history of nasal stertor followed by a several day history of vision loss with dilated pupils and decreased pupillary light reflexes
Sagittal T2 weighted image of the brain and nasal passages reveals a mass in the sphenoid sinus extending through the skull into the olfactory lobe region of the brain
What's your differential diagnoses?