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Fig. 6A —52-year-old woman with choroidal melanoma. Typical sonographic features include hypoechoic mass, lobular in shape, with marginal retinal elevation (large arrow). Hyperechoic rim is combination of elevated retina and peripheral blood vessels. Characteristic hypoechoic echotexture is also seen in A-mode scan (graph at bottom), which shows decreased reflectivity between two small arrows corresponding to margins of mass, a feature that sometimes helps distinguish it from other types of tumor (see Figs. 13, 14A, 14B, and 15).