TTN and myasthenia gravis: The patient serum was positive for anti-AchR and anti-Titin antibodies.<h4>Diagnoses</h4>The patient was diagnosed FOSMN with MG.<h4>Interventions</h4>The patient symptoms were relieved after pyridostigmine bromide and prednisolone treatment.<h4>Outcomes</h4>Symptoms have improved.<h4>Lessons</h4>Facial-onset sensory and motor neuronopathy and MG have disparate clinical features.