25th June 2023

A 70-year-old man with a background of poorly controlled hypertension and type 2 diabetes mellitus presents with sudden onset dizziness

A 70-year-old man with a background of poorly controlled hypertension and type 2 diabetes mellitus presents with sudden onset dizziness, vertigo, and gait instability. A bidirectional nystagmus is noted on examination, as well as right-sided Horner’s syndrome, right-sided ataxia, with dysdiadochokinesia, and left-sided loss of pain and temperature sensation in the upper and lower limbs, with preserved motor functions bilaterally.

Which cranial nerve symptom below is he unlikely to manifest?