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Using Morphologic Parameters of Extraocular Muscles for Diagnosis and Follow-Up of Graves' Ophthalmopathy: Diameters, Areas, or Volumes?

Zsolt Szucs-Farkas1, Judit Toth1, Erzsebet Balazs2, Laszlo Galuska3, Kenneth D. Burman4, Zsolt Karanyi5, Andras Leovey5 and Endre V. Nagy5

1 Department of Radiology, Medical and Health Science Center, University of Debrecen, Nagyerdei krt. 98, H-4012 Debrecen, Hungary.
2 Department of Ophthalmology, Medical and Health Science Center, University of Debrecen, H-4012 Debrecen, Hungary.
3 Department of Nuclear Medicine, Medical and Health Science Center, University of Debrecen, H-4012 Debrecen, Hungary.
4 Endocrine Section, Department of Medicine, Washington Hospital Center, 110 Irving St., N.W., Washington, DC 20010-2975.
5 Department of Internal Medicine, Medical and Health Science Center, University of Debrecen, H-4012 Debrecen, Hungary.



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  		Fig. 1A. —42-year-old woman with Graves' ophthalmopathy. Unenhanced T1-weighted coronal MR image of orbits approximately 1 cm behind posterior pole of globe shows rectus muscles outlined in right orbit. Enclosed area gives Ameas (cross-sectional area) for corresponding muscle. In left orbit, long and short coronal diameters (Dlong and Dshort) are indicated. Estimated cross-sectional area for each muscle was calculated on basis of these diameters (Acalc = [Dlong x Dshort x {pi}] / 4).

 


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  		Fig. 1B. —42-year-old woman with Graves' ophthalmopathy. Unenhanced T1-weighted axial MR image shows largest diameters (Dmax) perpendicular to long axis of medial and lateral rectus muscles.

 


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  		Fig. 1C. —42-year-old woman with Graves' ophthalmopathy. Unenhanced sagittal T1-weighted MR image parallel to optic nerve shows corresponding maximal diameters (Dmax) for inferior rectus muscle and for superior muscle group.

 

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