Chewing oscillopsia. A case of voluntary visual illusions of movement
R. T. Knight, J. N. St John and T. Nakada
A 60-year-old man had a history of frontal headaches and chewing-related
oscillopsia. Examination disclosed a retro-orbital epidermoid cyst that had
eroded through the lateral orbital wall and under the temporalis muscle.
The illusion of movement was due to mechanical displacement of the tumor
mass and eye by contraction of the temporalis muscle. Removal of the cyst
produced complete remission of the oscillopsia.
