There is a long list of rare neuromuscular diseases. Nonetheless, there are a few that you are likely to see in the ED, that are relevant to Emergency Medicine because they require timely diagnosis and treatment. In this Part 2 of our 2-part series on acute motor weakness with Roy Baskind and George Porfiris, we keep it short and simple by limiting our discussion to the key clinical clues and management strategies of two of the more common acute life-threatening neuromuscular diseases, myasthenia gravis and Guillain Barré syndrome, and how to distinguish them from their mimics...