Detecting ultrasonographic hollowness in small choroidal melanocytic tumors using 10 MHz and 20 MHz ultrasonography: a comparative study

Background The purpose of this work was to compare the detection of ultrasonographic hollowness (UH), as a risk sign for evolution from small choroidal melanocytic tumors (SCMT) to uveal melanoma (UM), between conventional ultrasonography (standardized 8 MHz ultrasonography and B-mode 10 MHz ultrasonography) and high-resolution 20 MHz ultrasonography.