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MR Imaging Features of Giant Reservoir Formation in the Orbit: An Unusual Complication of Ahmed Glaucoma Valve Implantation

T.Y. Jeona, H.-J. Kima, S.T. Kima, T.-Y. Chungb and C. Keeb

a Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
b Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea


Figure 1
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  		Fig 1. A 22-year-old man with giant reservoir associated with Ahmed glaucoma valve implantation. A and B, Coronal T1-weighted (A) and fat-suppressed T2-weighted (B) MR images of the orbit show a 1.7-cm ovoid, thin-walled, purely cystic lesion in the superotemporal aspect of the right orbit between the lacrimal gland and the globe (arrows). A dark curvilinear band representing the silicone-made endplate of the implant is seen at the center of the cyst on both T1- and T2-weighted images. Also noted is mild indentation of the adjacent superotemporal wall of the right globe. C, Axial contrast-enhanced fat-suppressed T1-weighted MR image demonstrates no significant enhancement within the lesion.


Figure 2
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  		Fig 2. Ahmed glaucoma valve implant with a surface area of 184 mm2. A, Photograph shows the implant composed of 3 parts: 1) drainage tube, 2) valve, and 3) endplate. B, Photograph of the side of the implant shows the crescentic shape of the endplate with a thickness of 0.9 mm.





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X