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

Increased risk of metastatic cancer is associated with all of the following except:

d -- low IOP Melanomas of the iris are rare and usually present as elevated, vascular, darkly pigmented or amelanotic lesions usually located inferiorly.  Findings suggestive of a melanoma include growth, spontaneous hyphema, large size, vascularity, iris heterochromia, elevated IOP, angle involvement, glaucoma, and sector cataract.  Treatment may require a resection (sector iridectomy) or enucleation.