Optic nerve/sheath enlargement. A differential approach based on high-resolution CT morphology.
A wide variety of neoplastic and non-neoplastic processes can cause the intraorbital optic nerve and sheath to be enlarged on CT. The authors reviewed a large number of high-resolution CT scans and divided enlargement into three groups: tubular, fusiform, and excrescent. Further subdivision was possible by determining whether distinct optic nerve lucency was present or absent.
D003390:Cranial Nerve Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D009900:Optic Nerve / Q000000981:diagnostic imaging* / Q000473:pathology; D009901:Optic Nerve Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed