Multimodal imaging of unusual macular macroaneurysm rupture after navigated retinal laser in a patient with adult onset Coats disease

To report the uncommon rupture of a macular macroaneurysm (MAR) during navigated retinal laser (Navilas®) focal treatment in a patient with adult onset Coats disease. A 30-year-old man consulted for progressive decrease of vision in his right eye from one week. Fundoscopy examination showed macular hard exudates, aneurysms, vascular telangiectasias in the temporal inferior quadrant consistent with an adult onset Coats disease (CD). Spectral domain optical coherence tomography (SD-OCT) and fluorescein angiography (FA) revealed macular edema, vessels abnormalities associate to non-perfused areas. Ultra-widefield optical coherence tomography angiography (UWF-OCTA) clearly showed the blood flow abnormalities in both superficial and deep capillary plexus. Focal laser photocoagulation of abnormal vessels by navigated retinal laser and intravitreal injections (IVT) of aflibercept, successfully resolved macular edema. During supplemental navigated focal laser treatment, a macular macroaneurysm rupture occurred, causing intravitreal hemorrhage with a self-limiting resolution in three months. Indeed, visual acuity progressively improved during follow-up and absence of macular edema was observed at 18 months. Adult onset CD is a rare condition. Our patient presented an unusual intravitreal hemorrhagic complication due to a MAR rupture after focal navigated laser treatment. Despite this complication, early laser photocoagulation and IVT injections of anti-VEGF, successfully resolved macular edema. UWF-OCTA follow-up clearly showed abnormal vessels in both superficial capillary plexus (SCP) and deep capillary plexus (DCP) and successfully guided additional navigated focal laser treatment.