931-1 Paraneoplastic Opsoclonus

Identifier: 931-1 Title: Paraneoplastic Opsoclonus Subject: Opsoclonus; Ocular Flutter; Oscillopsia; Saccadic Oscillations; Paraneoplastic Cerebellar Syndrome; Adenocarcinoma of the Breast; Anti-Ri Antibody; Paraneoplastic Opsoclonus; Paraneoplastic Ocular Flutter; Saccadomania Description: This patient is the index case of the Anti-Ri antibody, published in Annals of Neurology in 1988 (4). The Anti-Ri antibody is recognized to be a paraneoplastic marker in patients with breast and gynecological malignancies (10). The history of this case is particularly important because she was initially misdiagnosed as a case of acute labyrinthitis.