A 66-year-old man experiences left eyelid drooping and double vision. What is the most likely diagnosis related to his symptoms?

The symptoms of left eyelid drooping (ptosis) and double vision (diplopia) in the 66-year-old man are suggestive of an issue affecting the structures responsible for eye movement and eyelid elevation, which are innervated by the oculomotor nerve (cranial nerve III) or the muscles controlling these functions.

Weber syndrome is characterized by a midbrain stroke that affects the oculomotor nerve, leading to contralateral hemiparesis and ipsilateral oculomotor nerve palsy. In this case, the left eyelid drooping indicates possible left oculomotor nerve palsy, and the double vision commonly associated with ocular motility problems aligns well with the features of Weber syndrome.

Other syndromes mentioned do not typically present with eyelid drooping and double vision as primary symptoms:

Gerstmann syndrome involves a constellation of symptoms including finger agnosia, agraphia, acalculia, and left-right disorientation, primarily associated with damage to the parietal lobe, and is not related to oculomotor function.

Wallenberg syndrome results from a posterior inferior cerebellar artery stroke, leading to issues such as dysphagia, atax