Anisocoria is a condition characterized by an unequal size of the pupils. The human eye The pupil is the central transparent area (showing as black). ...
To a certain extent, this is normal. Anisocoria to a mild degree (generally 0.3 to 0.5 mm) can be found in about 20% of people. This form is termed "simple anisocoria." However, anisocoria can be an indication of an underlying syndrome. Several pathologic states may alter the size of the pupil, for example, Horner syndrome or a lesion of the oculomotor nerve. A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ... Horners syndrome is a set of symptoms on one side of the face suggesting damage to the sympathetic nervous system. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ...
A brain tumor is any intracranial mass created by an abnormal and uncontrolled growth of cells either normally found in the brain itself: neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and...
References
"Anisocoria." Stedman's Medical Dictionary, 27th ed. (2000). ISBN 0-683-40007-X
Victor, Maurice and Allan H. Ropper. Adams and Victor's Principles of Neurology, 7th ed. (2001). ISBN 0-07-067497-3
Anisocoria may result from any of several pathophysiologies; however, it is useful to keep in mind the basic anatomy when evaluating such patients.
No general statistics on the prevalence of anisocoria exist, probably because of the diversity of causes; however, anisocoria is a frequently encountered situation in the clinic.
Imaging often is undertaken in Horner syndrome, and it may be aimed at the medulla, cervical cord, apex of the lung, carotid artery, or cavernous sinus, as indicated by the examination.
Anisocoria: Both pupils are usually of equal size.
If they are not, that is termed anisocoria (from "a-", not + "iso", equal + "kore", pupil = not equal pupils).
The pupil may appear to open (dilate) and close (constrict) but it is really the iris that is the prime mover; the pupil is merely the absence of iris.
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