PMC3508748_01
Contrast-enhanced axial CT of the orbit shows preseptal swelling and thickening of the orbital septum on the right. Note thickening and enhancement of uveal tract on right. No obvious abnormality seen in vitreous chamber.
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Contrast-enhanced CT showed marked enhancement of the uveal tract on the right with preseptal edema and lateral thickening of the orbital septum (Figure 1), however, there was no retrobulbar fat stranding or posterior chamber abscess detected.
FLAIR axial image (A) depicts high signal in the right vitreous (arrowheads) suggestive of subchoroidal effusion. Note low signal in normal vitreous on the left due to fluid suppression. DWI sequence (B) and corresponding ADC map (C) demonstrate restricted diffusion (bright signal) within the vitreous chamber on the right and confirms a subchoroidal abscess (arrowheads).The mean ADC value in the subchoroidal abscess was 602 x 10-6 mm2/s, and in the central portion 2650 x 10-6 mm2/s. The left globe was normal, with a mean ADC of 2737 x 10-6 mm2/s.
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Fluid attenuation inversion recovery (FLAIR) axial images demonstrated a definite signal change in the right vitreous chamber and a high signal subchoroidal effusion was seen (Figure 2A). Effusion was seen as a linear high signal within the right globe laterally extending up to the level of the optic nerve head (Figures 2B and C).
Contrast-enhanced FS axial and coronal T1-weighted images (A, B) reveal enhancement of the uveal tract and the subchoroidal abscess on the right along with preseptal edema. Also note the extension into the retrobulbar fat and extra-ocular muscles, outlining the extent of the inflammatory process.
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On postcontrast T1 fat saturated images, diffuse enhancement of the thickened sclera and the entire uveal was identified (Figure 3).