Benign paroxysmal positional vertigo with congenital nystagmus: A case report

Figure 1 Nystagmus in the roll test. A and B: When the head was to the right, intensive nystagmus occurred between 13 s and 32 s with dizziness and nausea; the highest slow phase velocity (SPV) was 162°/s and then weakened gradually to 8°/s, and vertigo disappeared; C and D: When the head was to the left, the intensive nystagmus occurred between 9 s and 30 s with dizziness; the highest SPV was 62°/s and then weakened gradually to 9°/s, and vertigo disappeared.

Figure 2 Spontaneous nystagmus and nystagmus in the gaze test. A: The intensity of spontaneous nystagmus was 20°/s, and it was constant; B: When the eyes moved to right, the direction of nystagmus changed to left, and the slow phase velocity (SPV) of nystagmus was 7°/s; C: When the eyes moved to left, the nystagmus was still to the left, and the SPV of nystagmus was 8°/s.