Autoimmune retinopathy with onconeuronal antibodies: Case report.

We present a case of autoimmune retinopathy in a patient with unknown small cell lung cáncer (SCLC), which was diagnosed after ophthalmological examination. Serology was positive for CV2/CRMP5 onconeuronal antibodies. Autoimmune retinopathy is a rare entity that can be missed and underdiagnosed. It is produced by an immune-mediated reaction against retinal antigens. The importance of its early diagnosis lies in the fact that in many of the patients, ocular symptoms appear before the diagnosis of the primary cancer, so its early identification and referral for an extension study may lead to the diagnosis of a hidden primary neoplasm.