Orbital Volumetry in Graves' Orbitopathy: Muscle and Fat Involvement in relation to Dysthyroid Optic Neuropathy
Figure 1
Axial and coronal CT images of 3 representative patients with Graves’ disease complicated with GO ((a)–(c)) and one control patient (d). The regions of interest are drawn on each coronal slice. Patient (a) has GO with predominant muscle enlargement. Patient (b) has GO with predominant enlargement of orbital fat in the right orbit whereas the left orbit is less affected. Patient (c) has enlargement of both orbital muscles and fat in both orbits and the visual acuity was reduced to 6/18 in the left orbit as a result of DON. The visual acuity was reduced to 6/6 in the right orbit. The patient shown in (d) had a floor fracture in the left orbit and the right orbit served as one of the 13 normal controls.
