19th February 2024

A 34-year-old female presents to the acute medical unit with a 3-day history of nystagmus.

A 34-year-old female presents to the acute medical unit with a 3-day history of nystagmus. Examination reveals nystagmus towards the left at rest and has ongoing left-sided nystagmus on both left and right gaze. There is no vertical skew on the cover test. On the head impulse test, corrective saccades were noted when his head was turned from the right to the midline.

Based on the examination findings below, which anatomical structures have been involved?