PURPOSE: To describe an unusual case of idiopathic retinal vasculitis, 
aneurysms, and neuroretinitis (IRVAN) syndrome with rapid dynamics in the number 
and appearance of the aneurysms.
DESIGN: Observational case report.
METHODS: Clinical and angiographic data of the patient were reviewed.
RESULTS: In the course of only 6 months, preexisting retinal aneurysms resolved 
while new ones appeared. Changes were observed in the shape and size of 
preexisting lesions. The resolution of lesions in eyes previously untreated by 
laser is reported for the first time.
CONCLUSIONS: Vascular lesions in IRVAN syndrome may show an unusually rapid 
turnover. The resolution of aneurysms is a part of the natural course of the 
disease and may occur without previous retinal laser photocoagulation.