9th September 2020

A 45-year-old male smoker presents with a history of gradual onset unilateral ptosis and miosis

A 45-year-old male smoker presents with a history of gradual onset unilateral ptosis and miosis. He has a history of significant weight loss.

For the patient above, please select the SINGLE most likely underlying cause of their pupillary abnormality. Select ONE option from the list above.