![]() ![]() “Here, aneurysm grows close to the third cranial nerve and can sometimes cause sudden compression of the nerve and cause a third cranial nerve palsy, which will occasionally manifest as dilatation of the pupil on the side of the aneurysm,” continues Dr. “Aneurysms can also cause anisocoria, particularly in a location known as the posterior communicating artery or PCOM.” Aneurysms and Unequal Pupil Size “Typically, the difference in pupil diameters is less than 1.0 mm and may vary from day to day,” says Dr. Russavia [CC BY 3.0“Physiological anisocoria is a common finding that can occur in approximately 20 percent of the normal population,” says Farhan Siddiq, MD, a neurosurgeon with University of Missouri Health Care. Traumatic bilateral fourth nerve palsy: Double vision induced by downward gaze after head injury.Physiological anisocoria. The measurement of eye movements in mild traumatic brain injury: A structured review of an emerging area.
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