Fig. 15. Retained subretinal perfluorocarbon. B-scan demonstrating disorganized vitreous opacities and membranes with linear highly reflective densities (arrowheads) causing orbital shadowing.

vitreous cavity.49 Secondary to these acoustic boundaries, conventional ophthalmic B-scan is unreliable in the differential diagnosis of intraocular structures in silicone-filled globes. There is usually a small amount of silicone oil remaining in the eye after it is removed surgically, which on ultrasound appears as a highly reflective echoes scattered in the vitreous cavity (Fig. 14B).

Retained Perfluorocarbon Liquids

Perfluorocarbon liquids often are used as a vitreous substitute during virtreoretinal surgery to aid in the repair of complicated RDs because of their very high specific gravity and ability to provide countertraction and retinal stabilization.50 Small amounts of perfluorocarbon liquid can be retained postoperatively because of poor visualization of the liquid.51 Several studies have demonstrated there is significant retinal and corneal toxicity associated with intraocular retention of perfluorocarbon liquids.52,53 Retained perfluorocarbon liquids can be visualized on ultrasound as highly reflective echoes causing shadowing of the orbit (Fig. 15).

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