Symptoms that an Unruptured Aneurysm May Cause “Anisocoria, or unequal pupil size, may be an early sign of an impending neurologic emergency and often suggestive of a life threatening condition affecting cranial nerve function, such as tumour compression, intracranial hypertension with impending uncal herniation, expanding intracranial aneurysm, or haemorrhage,” says a paper in the Indian Journal of Anaesthesia (July/August 2010, Yalcin et al).
Other Dangerous Causes of Uneven Pupil Size People have suffered from ruptured aneurysms because they ignored the warning signs. Nevertheless, it’s always a smart idea to be informed. “Interestingly, diabetes can also cause these symptoms, so urgent tests are required to rule out a ruptured PCOM aneurysm.”Īs frightening as this may sound, there is no reason to obsess over the size of your pupils by frequently inspecting them in magnifying mirrors. “Any sudden change in the size of the pupil on a previously normal individual should raise suspicion. There may or may not be double vision associated. “The pupillary dilatation is not a variable but may still be responsive to light. “Usually this dilatation is painless, but pain could be associated with it, indicating a possible recent rupture of the aneurysm. “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.
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