Transient weakness of the face, arm or leg may be a presenting feature of TIA or of hypoglycaemia. If the weakness lasts more than 24 hours and is of acute onset then stroke is the most likely diagnosis but CT should still be performed to confirm this.

An important differential diagnosis when weakness affects a part of a leg or arm, and is of non-acute onset, is a diabetic mono neuropathy such as femoral amyotrophy.

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