Motor neurone disease: diagnostic pitfalls.

The misdiagnosis of MND (particularly of the ALS phenotype), is uncommon. Atypical presentations, particularly of focal onset and with pure LMN or UMN signs, present a more difficult diagnostic challenge, although perhaps reassuringly, treatable mimics are rare. A working knowledge of potential alternative conditions and MND diagnostic pitfalls should help to reduce the misdiagnosis rate, particularly if the key points are considered.