2024年5月27日 · The optic nerve is the second (CN II) cranial nerve (TA: nervus opticus or nervus cranialis II). It is a purely sensory nerve that conveys visual information from the eye to the brain . The nerve arises from the back of the globe exiting the orbit via the optic canal .

2024年6月14日 · MRI is the modality of choice for visualizing the optic nerve. Functional MRI or multifocal visual evoked potentials have also been shown to allow early diagnosis 1. MRI. Typically findings are most easily identified in the retrobulbar intra-orbital segment of the optic nerve, which appears swollen, with a high T2 signal.

Abnormal thinning of the left optic nerve with loss of volume in comparison to the right side.

2024年7月24日 · The optic nerve sheath demonstrates changes in diameter with CSF pressure changes as there is a layer of subarachnoid space between the nerve and its sheath, which expands due to raised intracranial pressure. These changes are appreciated more along the anterior aspect of the nerve.

2025年2月15日 · Optic neuropathy is a broad term and can result from a variety of causes. Pathology. genetic. Leber hereditary optic neuropathy and other mitochondrial disorders. compression or trauma (traumatic optic neuropathy) optic nerve sheath meningioma. progressive diaphyseal dysplasia. thyroid-associated orbitopathy. shear injury

2023年12月23日 · Enlargement of the optic nerves is uncommon. Swelling of the optic nerves has a surprisingly broad differential. Etiology. neoplastic. optic nerve glioma; optic nerve meningioma; leukemia; orbital lymphoma; metastases; juvenile xanthogranuloma; medulloepithelioma; involvement by retinoblastoma; cyst of optic nerve sheath; non-malignant ...

2025年2月3日 · The CT and MRI appearance relates to the dural anatomy of the optic nerve, which is continuous with the subarachnoid space, thereby allowing increased intracranial pressure (ICP) to be transmitted to the optic disc. In most cases, the papilledema is bilateral.

2025年1月29日 · They are characterized by imaging by an enlarged optic nerve seen either on CT or MRI. Usually showing low T1 and a high central T2 signal on MRI images, enhancement is variable.

2024年5月27日 · Optic nerve meningiomas are benign tumors arising from the arachnoid cap cells of the optic nerve sheath and represent ~20% of all orbital meningiomas, the majority of which are direct extensions from intracranial meningiomas.

Atrophy of intraorbital and intracanalicular segments of both optic nerve without enhancement consistent with bilateral optic nerve atrophy.