Fig. 7. A. A typical iris tumor is easily visualized. Unfortunately, with atypical iris-ciliary body lesions, it may be difficult sometimes to differentiate different processes. B.A cystic change in a melanoma. On ultrasound, it is uncertain whether this is a benign or malignant lesion. Similarly, we are unable differentiate different types of neoplasms with this technique, and we have seen a few other anterior segment malignancies simulate melanoma on high-frequency ultrasound. Even with high-frequency ultrasound, we are unable to diagnose a “ring” melanoma.