Determining the onset, severity, and chronicity of symptoms can be vital in delineating between the various etiologies of a CN 4 palsy. Furthermore, careful history including associated symptoms and other past medical history can help distinguish a CN 4 …

2024年11月1日 · Fourth nerve palsy (trochlear nerve palsy) happens when issues with your fourth cranial nerve cause vertical (up and down) eye movement and vision issues. It usually affects one eye (unilateral) but can affect both (bilateral).

Fourth cranial nerve palsy or trochlear nerve palsy, is a condition affecting cranial nerve 4 (IV), [1] the trochlear nerve, which is one of the cranial nerves. It causes weakness or paralysis of the superior oblique muscle that it innervates.

The manifestations and diagnosis of fourth nerve palsy, also known as superior oblique paralysis and trochlear nerve palsy, are reviewed here. Palsies of the third and sixth cranial nerves are discussed separately.

2023年3月14日 · Cranial nerve palsy occurs when one of the 12 pairs of nerves that lead from the brain to the face, head or torso loses function. A loss of function of the cranial nerves to the eyes and face can cause symptoms such as weakness, limited movement, double vision, droopy eyelid or a dilated pupil.

2024年9月8日 · Palsy of the trochlear nerve is a common presentation in ophthalmology clinics.[1] The fourth cranial nerve, also known as the trochlear nerve, arises from the midbrain at the level of the inferior colliculus (ventral to the Sylvian aqueduct).

Fourth nerve palsy means that a certain muscle in your eye is paralyzed. It is caused by disease or injury to the fourth cranial nerve. In children, it is most often present at birth (congenital).

Fourth cranial nerve palsy impairs the superior oblique muscle, causing paresis of vertical gaze, mainly in adduction. (See also Overview of Neuro-ophthalmologic and Cranial Nerve Disorders.) Fourth cranial (trochlear) nerve palsy is often idiopathic. Few causes have been identified. Causes include the following:

A palsy of the 4th cranial nerve affects vertical eye movements. Often doctors cannot identify the cause, but when they can, the cause is usually a head injury, sometimes a minor one. People see double images, but tilting the head to the side opposite the affected eye can eliminate them.

2019年12月11日 · The two most common causes of fourth nerve palsy are trauma (unilateral or bilateral fourth nerve palsy) and decompensation of a congenital fourth nerve palsy. An isolated fourth nerve palsy occurring in a patient older than 50 and with atheromatous vascular risk factors is often a microvascular fourth nerve palsy.