MALIGNANT TRANSFORMATION OF A CHOROIDAL NEVUS AFTER 19 YEARS OF OBSERVATION FOLLOWED BY RAPID PROGRESSION OF THE CHOROIDAL MELANOMA.

Purpose: To describe the case of a woman who developed rapid progression of a choroidal melanoma after 19 years of observation of a previously treated choroidal nevus.

Methods: A 71-year-old woman with a 22-year history of a choroidal nevus was observed for 19 years after undergoing transpupillary thermotherapy for a localized, macula-involving, exudative, retinal detachment. Five months after her most recent stable examination, she presented for routine follow-up.

Results: The lesion was noted to have increased thickness with the development of lipofuscin and subretinal fluid, suggestive of malignant transformation. In the 1 month between diagnosis and treatment with iodine-125 plaque brachytherapy, the lesion continued to expand, requiring a radiation dose adjustment.

Conclusion: Choroidal nevus transformation into melanoma has been well-documented, highlighting the need for routine follow-up. Treatment within 1 month is typically sufficient for appropriate management. Occasionally, melanomas may grow substantially between diagnosis and treatment, suggesting that repeat measurement may be necessary in rare instances to ensure appropriate radiation treatment.