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Treatment for this type of palsy may include patching, prisms, or even surgery if necessary. top of page. Sixth Cranial Nerve (Abducens Nerve) Palsy. Sixth cranial nerve palsy, also referred to at Abducens nerve palsy, can be caused by a head injury, brain tumors, infections, aneurysms, or multiple sclerosis.Depending on the condition, there may be increased pressure on the affected nerve or a decrease in blood flow to the nerve.reatment for this type of palsy may include patching, prisms, or even surgery if necessary. top of page. Sixth Cranial Nerve (Abducens Nerve) Palsy. Sixth cranial nerve palsy, also referred to at Abducens nerve palsy, can be caused by a head injury, brain tumors, infections, aneurysms, or multiple sclerosis.
Etiology. Third cranial (oculomotor) nerve disorders that cause palsies and affect the pupil commonly result from aneurysms (especially of the posterior communicating artery) and transtentorial brain herniation (see Brain herniation. ) and less commonly from meningitis affecting the brain stem (eg, TB meningitis).The most common cause of palsies that spare the pupil, particularly partial palsies, is ischemia of the 3rd cranial nerve (usually due to diabetes or hypertension) or of the midbrain.Occasionally, a posterior communicating artery aneurysm causes oculomotor palsy and spares the pupil. and less commonly from meningitis affecting the brain stem (eg, TB meningitis). The most common cause of palsies that spare the pupil, particularly partial palsies, is ischemia of the 3rd cranial nerve (usually due to diabetes or hypertension) or of the midbrain.