title: Focal laser ablation of retinal angiomatous proliferation.
abstract: OBJECTIVE
  To evaluate the feasibility of focal laser ablation of retinal angiomatous proliferation (RAP) identified with clinical examination and high-speed indocyanine green (ICG) imaging in patients with age-related macular degeneration.
  
  
  METHODS
  In this retrospective, interventional case series, 16 consecutive eyes of 15 patients with macular degeneration and leakage from a stage I or II RAP lesion were identified. RAP lesions were identified using clinical examination and high-speed ICG imaging. High-speed ICG imaging was used to identify the intraretinal component of the lesion. RAP lesions were treated with a 100- to 200-mum green or yellow wavelength laser spot that was applied to completely ablate the intraretinal component of the lesion. In eyes with stage II lesions, the subretinal component of the lesion was not treated. Early Treatment of Diabetic Retinopathy Study visual acuity, optical coherence tomography retinal thickness, angiographic leakage, and progression of the angiomatous process shown by ICG imaging were evaluated preoperatively and postoperatively.
  
  
  RESULTS
  Sixteen eyes underwent successful ablation of the RAP lesions with an average of 1.9 treatment sessions. At a mean follow-up of 15.5 months, 94% of eyes had stable or improved visual acuity. Only 6% of eyes had a loss of >or=3 lines of visual acuity. The average visual acuity at the last follow-up was 20/45 in the stage I lesion group and 20/160 in the stage II lesion group. Of the patients, 87.5% had a reduction in retinal edema and subretinal fluid, with 69% of patients having complete resolution of retinal edema and subretinal fluid; 14% of patients had progression to retinal choroidal anastomoses. No treatment complications were encountered.
  
  
  CONCLUSIONS
  Focal laser photocoagulation of RAP lesions appears to be feasible. This treatment appears to be a safe method of managing the leakage from RAP. Treatment of solely the intraretinal component of the lesion may be adequate to control leakage. Treatment may allow the angiomatous process to be arrested, resulting in stabilization of visual acuity. Visual acuity results appear to be better for patients with early stage lesions.
authors.affiliation: National Retina Institute, Chevy Chase, MD 20815, USA.
authors.forename: T Mark
authors.initials: TM
authors.lastname: Johnson
authors.forename: Bert M
authors.initials: BM
authors.lastname: Glaser
mesh_terms: D000369:Aged, 80 and over; D000798:Angiomatosis / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D002199:Capillary Permeability; D004396:Coloring Agents; D005240:Feasibility Studies; D005260:Female; D005451:Fluorescein Angiography; D005500:Follow-Up Studies; D006801:Humans; D007208:Indocyanine Green; D017075:Laser Coagulation / Q000379:methods*; D008268:Macular Degeneration / Q000175:diagnosis / Q000209:etiology / Q000601:surgery; D008297:Male; D015861:Retinal Neovascularization / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D012171:Retinal Vessels / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence; D016896:Treatment Outcome; D014792:Visual Acuity
chemical_list: D004396:Coloring Agents; D007208:Indocyanine Green