(DH) AQP4‐Ab‐positive NMOSD and AChR‐Ab‐positive myasthenia gravis; no clear clinical onset with visual acuity of 0.05 of the right eye with severe atrophy of the optic nerve, additionally, oculomotor symptoms of no definite origin, most probably due to the myasthenia gravis. The gene discussed is AQP4; the disease is myasthenia gravis.