case_images: PMC11006958_01
case_images: Otoconia displaced in the left posterior semicircular canal can move in an excitatory direction in a right DHT, therefore, it is critical for clinicians to perform the DHT for both sides.
case_images: fresc-05-1384151-g001.jpg
case_images: PMC11006958_01_fresc-05-1384151-g001.jpg
case_images: F1
case_images: Figure 1 illustrates how the left posterior semicircular canal could be excited during a right DHT.
case_images: PMC11006958_02
case_images: Otoconia displaced in the left posterior semicircular canal can move in an inhibitory direction in a right DHT, therefore, it is critical for clinicians to perform the DHT for both sides.
case_images: fresc-05-1384151-g002.jpg
case_images: PMC11006958_02_fresc-05-1384151-g002.jpg
case_images: F2
case_images: Given the slower velocity downbeat with clearly observable right torsional nystagmus in the right DHT (consistent with an inhibitory response), coupled with a robust upbeat and left torsional nystagmus in left DHT:we reasoned the likely cause is the left posterior semicircular canal being inhibited and excited, respectively (Figure 2).
case_images: PMC11006958_03
case_images: PMC11006958_04