Quantification of orbital apex crowding for screening of dysthyroid optic neuropathy using multidetector CT.

ABSTRACT:

Background and purpose

DON, a serious complication of GO, is frequently difficult to diagnose clinically in its early stages because of confounding signs and symptoms of congestive orbitopathy. We evaluated the ability of square area measurements of orbital apex crowding, calculated with MDCT, to detect DON.

Materials and methods

Fifty-six patients with GO were studied prospectively with complete neuro-ophthalmologic examination and MDCT scanning. Square measurements were taken from coronal sections 12 mm, 18 mm, and 24 mm from the interzygomatic line. The ratio between the extraocular muscle area and the orbital bone area was used as a CI. Intracranial fat prolapse through the superior orbital fissure was recorded as present or absent. Severity of optic nerve crowding was a

SUBMITTER: Goncalves AC 

PROVIDER: S-EPMC7966547 | biostudies-literature | 2012 Sep

REPOSITORIES: biostudies-literature