Saowapa S.Adu Y.Parmar K.Agusala V.Srifuengfung G.Polpichai N.Siladech P.Tanariyakul M.Mahidol University2025-01-242025-01-242025-01-01Baylor University Medical Center Proceedings (2025)08998280https://repository.li.mahidol.ac.th/handle/20.500.14594/103014Choreoathetosis is a rare complication of paraneoplastic syndrome, particularly associated with small cell lung cancer. We report a case of an elderly woman with small cell lung cancer who was diagnosed with choreoathetosis due to autoimmune-mediated paraneoplastic syndrome. The differential diagnoses for focal neurological deficits such as stroke, immunotherapy-related toxicity, radiation-induced toxicity, and brain metastasis were considered but the presence of onconeural antibodies made paraneoplastic syndrome a more likely diagnosis. Management of choreoathetosis in paraneoplastic syndrome can be challenging, with limited treatment options available.MedicineArticleSCOPUS10.1080/08998280.2024.24486372-s2.0-8521444122615253252