Burger sign: Ahmed glaucoma valves on magnetic resonance imaging.

A 17-year-old girl with congenital rubella syndrome underwent glaucoma filtration surgery with Ahmed glaucoma valves (AGV). The T2 hyperintense fluid-filled blebs on either side of the T2 hypointense central silicone plate of the AGV on coronal magnetic resonance imaging (MRI) of the orbit showed up mimicking a burger (arrows) [Fig. 1].[1] Hence, we termed this the “burger sign“ so that radiologists and ophthalmologists are aware of this distinctive feature and can differentiate it from other cystic orbital lesions such as dermoids.[2]

Figure 1

Coronal section of T2-weighted Magnetic Resonance Imaging (MRI) orbits showing the AGV plates with surrounding filtering blebs at supero-temporal quadrants of both orbits (Arrows) which look like burgers

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