Non-exhaustive differential diagnoses for acute bilateral ptosis
| Site | Cause |
|---|---|
| Midbrain /brainstem | Stroke, basilar artery occlusion |
| Paraneoplastic | |
| Infective encephalitis | |
| Miller Fisher syndrome and Bickerstaff's encephalitis | |
| Syphilis | |
| Tumour | |
| Thiamine deficiency | |
| Neuromyelitis optica spectrum disorder | |
| Bilateral cranial nerve III | |
| Subarachnoid space | Aneurysm, meningitis |
| Cavernous sinus | Cavernous sinus thrombosis, pituitary apoplexy, caroticocavernous fistula, tumour, lymphoma |
| Neuromuscular junction | Myasthenia gravis |
| Botulism | |
| Muscle | Graves’ disease |
| Mitochondrial myopathy | |
| Muscular dystrophy | |
| Other | Functional |