Table 1

Anti-GQ1b antibody syndrome

Subtypes	Signs required for diagnosis
Subtypes	External ophthalmoplegia	Ptosis	Mydriasis	Oropharyngeal palsy	Ataxia	Impaired consciousness or hyperreflexia	Areflexia or hyporeflexia	Arm weakness	Leg weakness
Fisher–Bickerstaff syndrome
Fisher syndrome	√				√		√
Incomplete forms
Acute ophthalmoparesis (without ataxia)	√
Acute ptosis		√
Acute mydriasis			√
Acute oropharyngeal palsy				√
Acute ataxic neuropathy (without ophthalmoplegia)					√
Ataxic Guillain–Barré syndrome					√
Acute sensory ataxic neuropathy					√
Bickerstaff brainstem encephalitis	√				√	√
Pharyngeal-cervical-brachial weakness				√				√
Overlap
Fisher–Bickerstaff syndrome overlapped by pharyngeal-cervical-brachial weakness				√				√
Fisher–Bickerstaff syndrome overlapped by Guillain–Barré syndrome				√				√	√