![]() Duplication for commercial use must be authorized in writing by ADAM Health Solutions. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. Douglas Miller Conference paper 88 Accesses Abstract When active cerebral vasodilatation occurs during progressive supratentorial brain compression it causes increasingly large rises in ICP. There is no harm in getting a CT scan or MRI of the brain done as your brother. Intracranial Pressure II pp 444446 Cite as Effects of Hypercapnia on Pupillary Size, ICP and Cerebral Venous PO 2 during Experimental Brain Compression J. Aneurysms, bleed in the brain, glaucoma, meningitis and tumora also cause unequal pupil size. It is also a sign of serious brain injury. ![]() This site complies with the HONcode standard for trustworthy health information: verify here. This is due to an abnormality in the musculature of the iris or in the parasympathetic or sympathetic innervations to the pupil. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Injury to the carotid or vertebral arteryĪ.D.A.M., Inc.Tumor, mass, or lymph node in the upper chest or lymph node causing pressure on a nerve may cause decreased sweating, a small pupil, or drooping eyelid all on the affected side (Horner syndrome).Seizure (pupil size difference may remain long after seizure is over).Infection of membranes around the brain ( meningitis or encephalitis).Increased intracranial pressure, because of brain swelling, intracranial hemorrhage, acute stroke, or intracranial tumor.Increasing ICP causes an increase in the. Excess pressure in one eye caused by glaucoma Increasing ICP causes unequal pupils as a result of pressure on the third cranial nerve.Brain tumor or abscess (such as, pontine lesions).Bleeding inside the skull caused by head injury.Other causes of unequal pupil sizes may include: Other medicines that get in the eyes, including medicine from asthma inhalers, can change pupil size. The use of eye drops is a common cause of a harmless change in pupil size.
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