A 46-Year-Old Presenting With Inferior Mononuclear Visual Field Defect as the Sole Manifestation of Neurosarcoidosis

Neurosarcoidosis (NS) is a rare manifestation of sarcoidosis that lacks an organized body of knowledge regarding its diagnosis and management. There exists no clearly defined diagnostic criteria to make the diagnosis. To further complicate things, biopsy of the nervous system tissue remains complicated and not easily accomplished due to the sensitivity of the tissue and the subsequent deficits it could produce. In this case report, we present a patient who presented with acute inferior mononuclear quadrantanopsia with an insignificant past medical history and a lack of other signs and symptoms. Follow-up studies and magnetic resonance imaging of the orbits eventually led to the diagnosis of NS.