label: Optic nerve sheath dilatation
label_lc: optic nerve sheath dilatation
description: An abnormal increase in the diameter of the optic nerve sheath, typically due to elevated intracranial pressure or local pathology affecting cerebrospinal fluid (CSF) dynamics. It can be detected via imaging modalities such as ultrasound or MRI and may be associated with papilledema, idiopathic intracranial hypertension, or optic nerve tumors.