Sections of the eye confirmed a mushroom-shaped tumor (Figure, B) exclusively composed of a trabecular arrangement of epithelioid cells with abundant, finely granular, eosinophilic cytoplasm (Figure, C). Mitotic figures were present at 2 per 10 high-power fields. Intracytoplasmic brown pigment stained positive with Masson-Fontana stain. The cytoplasm stained positive with periodic acid–Schiff stain with resistance to diastase treatment. Vascular mimicry with a closed loop pattern was present. The tumor did not show extrascleral extension. Tumor cells stained positive for Melan-A, HMB-45 (Figure, D), and tyrosinase, confirming melanocytic lineage. They stained negative for keratin A1/A3, CD56, chromogranin, and synaptophysin, excluding epithelial (neuroendocrine) metastasis.