Causes of mydriasis caused by cerebral hemorrhage

Cerebral hemorrhage caused by mydriasis in most cases is caused by compression of the oculomotor nerve.

When the amount of cerebral hemorrhage is large, it can lead to increased intracranial pressure, resulting in displacement of brain tissue. When the displaced brain tissue presses the oculomotor nerve, it can lead to loss of pupil regulation function, resulting in unequal pupil size on both sides. If the amount of cerebral hemorrhage is relatively large, it will also cause diffuse brain swelling and bilateral mydriasis.

When mydriasis is large, immediate treatment is needed to control the bleeding.