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Retinal vascular changes associated with transpupillary thermotherapy for choroidal melanomas
Z I Currie1, I G Rennie, J F Talbot
1Ophthalmology Department, Royal Hallamshire Hospital, Sheffield, United Kingdom.
Retina (Philadelphia, Pa.)
|December 29, 2000
Summary
Transpupillary thermotherapy (TTT) for choroidal melanomas causes retinal vascular changes, primarily capillary loss within treatment zones. Vision loss can occur if the fovea is affected, but changes are usually confined to treatment margins.
Area of Science:
- Ophthalmology
- Oncology
- Vascular Biology
Background:
- Choroidal melanomas are primary malignant tumors of the uvea.
- Transpupillary thermotherapy (TTT) is a treatment modality for choroidal melanomas.
- Understanding the ocular side effects of TTT is crucial for patient management.
Purpose of the Study:
- To characterize retinal vascular alterations following TTT for choroidal melanomas.
- To evaluate the clinical significance and impact of these vascular changes on vision.
- To assess complications associated with TTT in this patient cohort.
Main Methods:
- Analysis of pre- and post-treatment stereoscopic fluorescein angiograms in 29 patients.
- Examination for patterns of retinal vascular damage.
- Prospective study of patient complications post-TTT.
Main Results:
- Widespread retinal capillary loss observed within treatment margins.
- High rates of retinal artery (83%) and vein (69%) occlusions, particularly involving large vessels.
- Subretinal choroidal neovascularization occurred in 4 cases; no retinal neovascularization.
- Foveal vascular damage led to visual loss in 6 patients; changes remained within treatment margins.
Conclusions:
- TTT induces distinct retinal vascular changes, including capillary loss and vessel occlusions.
- Vision impairment is possible if the fovea is involved, but changes are typically localized.
- A minor risk of neovascularization (choroidal and retinal) exists post-TTT.
