12th May 2024

A 55-year-old woman presents with episodic spells of dizziness, particularly when rolling over in bed or looking up.

A 55-year-old woman presents with episodic spells of dizziness, particularly when rolling over in bed or looking up. These episodes are brief, lasting less than a minute, but are intense and accompanied by a sensation of the room spinning. There is no associated hearing loss or tinnitus. The symptoms are provoked by changes in head position relative to gravity.

Which anatomical structure is most likely to be involved in this condition?