B-scan ultrasound in papilledema.
A. Diameter of the optic nerve sheath in a normal person.
B. Diameter of the optic nerve sheath in a patient with IIH.
C. Diameter of the optic nerve sheath in the same patient as (B) following lumbar puncture with therapeutic removal of CSF.
Image credit: Bäuerle J, Nedelmann M. B-mode sonography of the optic nerve in neurological disorders with altered intracranial pressure. Perspectives in Medicine 2012;1:404-407. Available online.
