[The characteristics of ultrasound biomicroscopy images of siderosis]

To evaluate the characteristics of ultrasound biomicroscopy (UBM) image and the rate of positiveness of diagnosis for foreign bodies in siderosis.Sixteen cases of siderosis were examined with UBM and the data ware analyzed, compared with the data of X-ray and the record of operation.The data of UBM showed deposition of rust in different tissues of eye-balls in the 16 cases of siderosis. Within the 10 cases of foreign bodies found by X-ray, only 4 cases were positive by UBM. X-ray data showed that the remaining 6 cases were negative of foreign bodies, but 1 case was found positive by UBM. The foreign bodies of the 11 cases were removed by operation. The characteristics of UBM images of foreign bodies displayed high and strong reflectivity with ultrasonic shadow, while the UBM image of siderosis showed multiple high and strong spot-like, speckled or thread-like shadows without "tails".UBM could detect the exact location of intraocular foreign bodies and rust. The positive rate of diagnosis for foreign bodies of UBM was lower than X-ray.