Isolated respiratory muscles weakness is an unusual presentation of Myasthenia Gravis (MG). We present a case of 49-year-old male with undiagnosed MG who presented with fluctuating dyspnea on exertion and at rest. There was no peripheral muscle involvement. diagnostic tests and standard electromyography was normal. https://www.diegojavierfares.com/best-save-Mac-Miller-Kids-Poster-deal-zone/