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A 72-year-old man presents with a retinal mass in his left eye. You suspect a malignant melanoma and order an ultrasound:

Which of the following is true regarding the ultrasound of melanomas?

d -- The tumors typically have low internal reflectivity. The size of a choroidal melanoma can accurately be followed with ultrasound and all patients with retinal tumors should have regular B-scans to document growth. The A-scan typically shows low internal reflectivity with characteristic reduction in amplitude from front to back. Only pathologic examination can reveal the cell type of the tumor.