The application of 20MHz B-scan and ultrasound biomicroscopy in the diagnosis of retinal detachment associated with choroidal detachment

Objective To explore the value of using 20MHz B ultrasound combined with ultrasound biomicroscopy in diagnosis of the rhegmatogenous retinal detachment associated with choroidal detachment.Methods A total of 311 cases (311 eyes) of primary rhegmatogenous retinal detachment patients were included,which were composed by 183 males and 128 females,aged from 19 to 71 years old (mean age 46.5±11.3 years).All patients underwent 10MHz B ultrasound,20MHz B ultrasound,ultrasound biomicroscopy (UBM) examinations respectively,and the images were recorded and assessed by a well-trained clinician.Analysis of X2 was adopted to compare the difference between 10MHz B ultrasound and 20MHz B ultrasound combined with ultrasound biomicroscopy.Results In 311 eyes of rhegmatogenous retinal detachment,11 eyes (3.54％) were detected associated with choroidal detachment by ophthalmological examination,13 eyes (4.18％) were detected associated with choroidal detachment by 10MHz B ultrasound,and the detection rate had no difference with ophthalmological examination (x2=0.17,P =0.68),20 eyes (6.43％) were detected associated with choroidal detachment by 20MHz B ultrasound,and the detection rate had no difference with ophthalmological examination (x2=2.75,P =0.10) and 10 MHz B ultrasound (x2=1.57,P =0.21),26 eyes (8.36％) were detected associated with choroidal detachment by UBM,and the detection rate was significantly higher than ophthalmological examination (x2=6.47,P =0.01) and 10 MHz B ultrasound (x2=4.62,P =0.03),30 eyes (9.65％) were detected associated with choroidal detachment by combination of 10 MHz B ultrasound and UBM,and the detection rate was significantly higher than ophthalmological examination (x2=7.22,P =0.01) and 10 MHz B ultrasound (x2=9.43,P =0.002).Conclusions Association of 20MHz B ultrasound and ultrasound biomicroscopy can significant improve the detection rate for rhegmatogenous retinal detachment associated with choroidal detachment.Cyclodialysis might be the early stage of choroidal detachment. Key words: 20MHz B ultrasound;  Ultrasound biomicroscopy (UBM);  Retinal detachment associated with choroidal detachment