ISPUB.COM The Internet Journal of Ophthalmology and Visual Science Volume 8 Number 2 1 of 4 Dispersion of Optic Disc Melanocytoma Following Argon Laser Photocoagulation. H Fesharaki, M Masjedi, G Naderian, A Salehi Citation H Fesharaki, M Masjedi, G Naderian, A Salehi. Dispersion of Optic Disc Melanocytoma Following Argon Laser Photocoagulation.. The Internet Journal of Ophthalmology and Visual Science. 2009 Volume 8 Number 2. Abstract Purpose: To report a case of optic disc melanocytoma (ODM) with a long term follow up after being treated by argon laser. Materials and Methods: This case describes a 63 year old white Iranian woman with optic disc melanocytoma in her right which was first detected during a routine eye examination at 1989, the eyes were otherwise normal. The size and the shape of the tumor were static until 1992 when argon green laser was applied over the lesion. Results: Tumor dispersion, vitreous seeding, changes in the tumor configuration, and apparent tumor enlargement was observed at the first post laser visit that happened three weeks after laser photocoagulation. Alterations in the tumor configuration were continued during the following year. From 1993 to 2010 the tumor remained static in shape but gradually lost some of its black hue color. Conclusion: Tumor dispersion, vitreous seeding, and tumor enlargement were the main observed complications of argon laser photocoagulation in this case of ODM. INTRODUCTION Laser photocoagulation treatment was found a useful option in the treatment of small choroidal melanomas. (1) Laser photocoagulation has not been considered for the treatment of optic disc melanocytoma (ODM), and there is no previous report about the effect of laser photocoagulation on this tumor. This case is a woman who mistakenly received argon laser photocoagulation for the treatment of her ODM and was followed for 17 years after laser application. Materials and Methods: A 63 year old white Iranian woman was found to have ODM in her right eye. This lesion was first detected during a routine eye examination at 1989 (figure 1). Figure 1 Figure 1: Fundus picture of the right eye of the 63 year old woman with optic disc melanocytoma at 1989. Visual acuity was 20/20 OU, ocular and systemic examinations were otherwise normal. On follow up fundus examinations, the size and the shape of the lesion and the visual acuity were static till 1992 (figure 2).