When Sight and Cancer Collide: A Rare Case of Paraneoplastic Bilateral Optic Neuritis.

Bilateral acute optic neuritis is a rare and challenging clinical presentation, often associated with conditions like multiple sclerosis or neuromyelitis optica spectrum disorder. We present the case of a 40-year-old woman with a complex medical history, including poorly differentiated squamous cell carcinoma of the cervix (stage IIIC), who presented with a swift and profound bilateral vision loss. Despite initial treatment with high-dose methylprednisolone and therapeutic plasma exchange, her optic nerve enhancement on MRI and negative autoantibody results raised suspicion of paraneoplastic optic neuritis. This prompted consultation with oncology, and the patient initiated chemotherapy. The rapid onset and progression of bilateral optic neuritis in the context of cervical carcinoma emphasize the importance of considering paraneoplastic syndromes in such cases. A multidisciplinary approach involving neurology, ophthalmology, and oncology specialists is vital for the diagnosis and management of these complex presentations. This case underscores the need for heightened awareness of paraneoplastic etiologies in patients with malignancies and unexplained neurological symptoms.