Miller Fisher syndrome.

A man aged 30 years presented to the emergency department (ED) with ataxia, areflexia, facial weakness, ophthalmoplegia, extremity weakness and back pain for 4 days. 4 days prior to attending the ED, the patient had suffered from diarrhoea for 2 weeks. The diagnosis of Miller Fisher syndrome was performed on the dual basis of clinical features in addition to an investigations report. Nerve conduction studies and anti-GQ1b IgG antibody analysis were requested. Once IgA deficiency was ruled out, the patient was started on intravenous immunoglobulin (400 mg/kg/day). 2016 BMJ Publishing Group Ltd.