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Ultrasound biomicroscopic features of anterior proliferative vitreoretinopathy
1Zhongshan Ophthalmic Center, Sun Yat-Sen University of Medical Sciences, Guangzhou, China. liuwen@public.guangzhou.gd.cn
Purpose:
To evaluate the utility of ultrasound biomicroscopy (UBM) in the diagnosis of anterior proliferative vitreoretinopathy (APVR).
Methods:
Ultrasound biomicroscopy (frequency, 50 MHz; depth of penetration, 5 mm; resolution, 40 microm) was used to examine 53 eyes of 52 subjects with rhegmatogenous or traumatic retinal detachment (RD). The results were compared with findings during vitrectomy.
Results:
In 43 eyes (42 patients), RD was detected using UBM, attaining 81% consistency with observations during operation. Among 36 eyes with surgically proved APVR, 33 (92%) had APVR detected by UBM. The UBM images showed shallow RD, circumferential contraction, or anterior displacement around the ora serrata. The anterior displacement could be classified into C-shaped anterior displacement, ciliary body adhesion, and pupil adhesion. Ultrasound biomicroscopy showed that a retinal step was formed on the surface of the ora serrata and the ciliary body. Failure to detect APVR by UBM may be due to severe choroidal detachment or a narrow palpebral fissure that hampers exposure of the ora serrata and the part of the eyeball posterior to it.
Conclusion:
Ultrasound biomicroscopy is a useful tool for the evaluation of APVR, which is difficult by ordinary methods. Ultrasound biomicroscopic images of APVR have typical features that may be used to help guide surgery and estimate prognosis.