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An 81-year-old man presented to the neurology department with a 2-month history of diplopia and recent onset of left-sided ptosis. He had also had pain in the left eye and left nasal congestion for the past month.
Two years ago, he had presented to a different department with a 6-month history of left upper lip and cheek paraesthesia, which was still present. At that time, a small (1×0.5 cm) mobile lump was found in the …