Characterization of idiopathic macular telangiectasia type 2 by fundus fluorescein angiography in Indian population.

PURPOSE To characterize the variations in fundus fluorescein angiography (FFA) features in idiopathic macular telangiectasia (IMT) type 2. METHODS Retrospective observational study. The authors included all the patients with IMT type 2 who underwent FFA during the period from January 2004 to December 2005. The main outcome measures were subretinal neovascularization and number and distance of telangiectasia from the center of the foveal avascular zone. RESULTS The mean age of 21 patients included in the study was 53.0+/-7.7 years. There were 11 women and 10 men. Six of the 21 patients had a history of diabetes mellitus. Subretinal neovascularization (SRN) was observed in 10 (23.8%) eyes. Subretinal plaque of pigment hyperplasia in the macula was found in 7 (21.9%) eyes, and crystalline yellowish deposits on the retinal surface were seen in 19 (59.4%) eyes. Only one eye had visible retinal telangiectasia. Most had more than 10 telangiectatic lesions in the macular area and the temporal macula was most commonly involved. The mean distance from the center of the foveal avascular zone (FAZ) up to which telangiectasia could be observed was 1340+/-400 microm. The maximum distance from the FAZ at which telangiectasia was identified was 2530 microm. CONCLUSIONS In IMT type 2, telangiectasia may be seen farther from the parafoveal area.