Non-Blast Phase Chronic Myelogenous Leukemia Presenting as Bilateral Infiltration of the Optic Nerve.

A 27-year-old woman presented with bilateral blurry vision for 2 weeks. She had a presumed diagnosis of idiopathic intracranial hypertension given her bilateral disc edema; however, bilateral disc and retinal infiltration was noted on ophthalmoscopy. This report presents a rare case of chronic myelogenous leukemia (CML) in the non-blast phase presenting as bilateral optic disc infiltration, indicating central nervous system involvement at the time of diagnosis. The patient had no other clinical symptoms at the time of diagnosis and was promptly treated with orbital radiation and a tyrosine kinase inhibitor, resulting in 20/20 vision in both eyes. [Ophthalmic Surg Lasers Imaging Retina 2025;56:102-107.].