PMC6160561_01
The caloric irrigations at 30 and 44  reveal a right areflexia with a peak slow phase velocity inferior to <= 5 /s.
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F1
The vestibular workup revealed a right areflexia to bithermal irrigations (peak slow phase velocity <= 5 /s at 30 and 44 ; Figure 1), a head impulse test pathological for the 3 right semicircular canals (Figure 2), symmetrical responses at horizontal torsion swing tests (0.05-0.1 Hz, omegamax = 60 /s), and presence of cervical and ocular vestibular evoked myogenic potentials (Figure 3).
The video-head-impulse-test (VHIT; Synapsis ; Marseille, F) is pathological for the 3 right semicircular canals.
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F2
The vestibular workup revealed a right areflexia to bithermal irrigations (peak slow phase velocity <= 5 /s at 30 and 44 ; Figure 1), a head impulse test pathological for the 3 right semicircular canals (Figure 2), symmetrical responses at horizontal torsion swing tests (0.05-0.1 Hz, omegamax = 60 /s), and presence of cervical and ocular vestibular evoked myogenic potentials (Figure 3).
The cervical and ocular vestibular evoked myogenic potentials (4 ms tone burst; 500 Hz; alternate polarity at 5 Hz) are present on both sides.
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F3
The vestibular workup revealed a right areflexia to bithermal irrigations (peak slow phase velocity <= 5 /s at 30 and 44 ; Figure 1), a head impulse test pathological for the 3 right semicircular canals (Figure 2), symmetrical responses at horizontal torsion swing tests (0.05-0.1 Hz, omegamax = 60 /s), and presence of cervical and ocular vestibular evoked myogenic potentials (Figure 3).
Graphic representation of the most impressive episode of palinopsia experienced by our patient.
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F4
When, after a few steps, his daughter told him that he was walking in a strange way, he became aware of his illusion (Figure 4).