2003
DOI: 10.1097/00041327-200306000-00008
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Environmental Tilt Illusion as the Only Symptom of a Thalamic Astrocytoma

Abstract: A 14-year-old girl experienced two episodes of environmental tilt illusion. During both episodes, which lasted less than 1 minute, she perceived all objects within view as rotated 45 degrees clockwise. There were no auras, accompanying symptoms, or sequelae. Neuro-ophthalmic examination findings were normal except for a right relative afferent pupil defect (RAPD). Imaging disclosed a cystic mass in the left posterior thalamus with compression of the brachium of the left superior colliculus. Stereotactic biopsy… Show more

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Cited by 7 publications
(3 citation statements)
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“…Sometimes RTI causes a feeling of tilting or inversion of the body [4]. Similar visuospatial misperception has been described as environmental tilt illusion [5], inverted vision [6], illusory body tilt [7], or reversal of vision metamorphopsia [8]. Since the patient had visual hallucinations and delusions of persecution, it is important to differentiate RTI from them.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Sometimes RTI causes a feeling of tilting or inversion of the body [4]. Similar visuospatial misperception has been described as environmental tilt illusion [5], inverted vision [6], illusory body tilt [7], or reversal of vision metamorphopsia [8]. Since the patient had visual hallucinations and delusions of persecution, it is important to differentiate RTI from them.…”
Section: Discussionmentioning
confidence: 99%
“…RTI has been reported in patients with various conditions, including central nervous system disease, peripheral vestibular disease, migraine and seizures, severe Guillain-Barre syndrome, and even under physiological conditions [1,[4][5][6][7][8]. It has been hypothesized that RTI is caused by disturbance of the integration of the visuospatial inputs with vestibular and proprioceptive sensations [1,4].…”
Section: Discussionmentioning
confidence: 99%
“…Karnath et al describe disturbed perceptions of postural uprightness in patients with lesions to the posterolateral thalamus, where patients perceive themselves as upright only when tilted toward the side of the lesion [35]. Lesions to posterolateral thalamus do not affect oculomotor function, but can result in abnormal SVV, gait abnormalities, and falls [36], as well as disturbed perceptions of environmental tilt [37]. Somatosensory loss from spinal cord injury or cerebral stroke also impairs the SVV and its adaptation to vestibular stimulation [38].…”
Section: Perception Of Verticalitymentioning
confidence: 99%