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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?

a. The precision of the B-scan does not allow for accurate, reproducible measurements of the tumor to be made and therefore can not be used to follow tumor growth. b. The tumors typically have high internal reflectivity. c. Characteristic signals from the ultrasound can suggest the cell-type of the tumor.   d. The tumors typically have low internal reflectivity.

For answers to the above, click here on or after September 12, 2006.