Muscle diseases: mimics and chameleons.

Muscle diseases are not as common as headaches and funny turns in our general neurology clinics, but most of us will encounter them. We all pride ourselves on a methodical approach to clinical problems-discovering the where and what in neurological parlance-but any diagnostic process can unravel, particularly if one condition resembles another. Before we settle on a diagnosis, we need to ask ourselves, whether the 'ducks all line up' to avoid cases of mistaken identity. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.