The extraocular muscles (EOM) are involved in a variety of disease processes with characteristic findings on imaging. EOM anatomy is described, followed by a review of adult EOM pathology. The imaging characteristics are explained with examples. The pattern of EOM disease on imaging, in corroboration with clinical findings, can often lead the radiologist towards a specific diagnosis.
CheungN.McNabA.A.Venous anatomy of the orbitInvest Ophthalmol Vis Sci2003; 44:988–995.
2.
BurchH.B.WartofskyL.Graves’ ophthalmopathy: current concepts regarding pathogenesis and managementEndocr Rev1993; 14:747–793.
3.
McKeagD.LaneC.LazarusJ.H.Clinical features of dysthyroid optic neuropathy: a European Group on Graves’ Orbitopathy (EUGOGO) surveyBr J Ophthalmol2007; 91:455–458.
4.
NagyE.V.TothJ.KaldiI.Graves’ ophthalmopathy: eye muscle involvement in patients with diplopiaEur J Endocrinol2000; 142:591–597.
5.
MayerE.J.FoxD.L.HerdmanG.Signal intensity, clinical activity and cross-sectional areas on MRI scans in thyroid eye diseaseEur J Radiol2005; 56:20–24.
6.
FirbankM.J.HarrisonR.M.WilliamsE.D.Measuring extraocular muscle volume using dynamic contoursMagn Reson Imaging2001; 19:257–265.
7.
KahalyG.J.Recent developments in Graves’ ophthalmopathy imagingJ Endocrinol Invest2004; 27:254–258.
8.
SepahdariA.R.AakaluV.K.SetabutrP.Indeterminate orbital masses: restricted diffusion at MR imaging with echo-planar diffusion-weighted imaging predicts malignancyRadiology2010; 256:554–564.
LaceyB.ChangW.RootmanJ.Nonthyroid causes of extraocular muscle diseaseSurv Ophthalmol1999; 44:187–213.
11.
LeeM.S.LessellS.Orbital myositis posing as cluster headacheArch Neurol2002; 59:635–636.
12.
GuptaA.ChazenJ.PhillipsC.Carcinoid tumor metastases to the extraocular muscles: MR imaging and CT findings and review of the literatureAm J Neuroradiol2011; 32:1208–1211.
13.
BonavolontaG.StrianeseD.GrassiP.An analysis of 2,480 space-occupying lesions of the orbit from 1976 to 2011Ophthal Plast Reconstr Surg2013; 29:79–86.
14.
VarmaA.SharmaK.RathiB.Isolated abscess of extraocular muscle in two young boys: clinical and imaging featuresOrbit2003; 22:67–72.
15.
SundaramP.M.JayakumarN.NoronhaV.Extraocular muscle cysticercosis: a clinical challenge to the ophthalmologistsOrbit2004; 23:255–262.
16.
RobinsonA.BeechT.McDermottA.SinhaA.Investigation and management of adult periorbital and orbital cellulitisJ Laryngol Otol2007; 121:545–547.