Optic Nerve Compression Secondary to a Posterior Ethmoid Pyomucocele

Optic neuritis is characterized as an acute, unilateral loss of vision associated with orbital pain. It is more prevalent in females, occurs most often in the third and fourth decades of life, and is associated with multiple sclerosis. Importantly, optic neuropathy secondary to other causes should be considered in patients presenting with atypical symptoms. We present a case of a compressive optic neuropathy due to an ethmoidal pyomucocele that was initially diagnosed as optic neuritis.