system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 50-year-old man comes to the physician because of diffuse weakness for the past several months. There is an anterior mediastinal mass on a lateral x-ray of the chest that was performed as part of a pre-employment medical evaluation. He has gastroesophageal reflux disease. His only medication is rabeprazole. He is 178 cm (5 ft 10 in) tall and weighs 77 kg (170 lb); BMI is 24.3 kg/m2. Vital signs are within normal limits. There is no cervical or axillary lymphadenopathy. Cardiopulmonary examination shows no abnormalities. The abdomen is soft and nontender; there is no splenomegaly. Further evaluation of this patient is most likely to show which of the following?
assistant
Acetylcholine receptor antibodies