TTN and embryonal carcinoma: Their final diagnosis included leptomeningeal metastasis of embryonal carcinoma (n = 1), overlapping NS-ab-negative encephalitis and MOG-ab-negative demyelinating syndrome (n = 1), GFAP-ab-positive encephalitis (n = 1), and probable neurodegenerative dementia with titin- and AchR-ab-positive myasthenia gravis (n = 1).