Retrobulbar Neuritis with Headache: A Case of Invasive Fungal Sphenoethmoidal Sinusitis

Retrobulbar neuritis is classically defined as a disease where "neither the patient nor the doctor sees anything." The present case was diagnosed as retrobulbar neuritis associated with extreme retrobulbar pain, an unusual constellation of features which led us to suspect an unusual etiology. Detailed investigations revealed invasive fungal sinusitis masquerading as retrobulbar neuritis. This case highlights the need to keep a high index of suspicion and caution while labeling a case as pure retrobulbar neuritis without performing neuroimaging to rule out life-threatening conditions