There is early weakness and atrophy of forearms and quadriceps and a third of patients also have mild facial weakness. Extraocular muscles are not affected and ptosis is rarely seen. [ncbi.nlm.nih.gov]

Causes[edit] Neurotoxic ptosis caused by botulinum toxin: a 14-year-old botulism patient with bilateral total ophthalmoplegia with ptosis (left image) and dilated, fixed pupils (right image). [en.wikipedia.org]

Initial neurological examination revealed left eyelid ptosis, hyporeflexia, positive Romberg sign, and ataxia. The ice pack test was negative. Three days later, contralateral ptosis was observed, associated with areflexia and worsened ataxia. [ncbi.nlm.nih.gov]

Ganglioside antibodies play an important role in the pathogenesis of acute polyradiculoneuropathy including MFS. [ncbi.nlm.nih.gov]