Susac's syndrome, a rare, potentially severe or lethal neurological disease.

Susac's syndrome (SS) is a rare, immune-mediated endotheliopathy affecting the microvasculature of the brain, the inner ear and the retina. Clinical presentation is characterised by a triad: encephalopathy, hearing loss and branch retinal artery occlusion (BRAO). Given the rarity of this disease, its natural history still remains partially unknown, but lethal cases appear to be extremely rare since there has never been, to our knowledge, a report of SS leading to death. We report 2 cases of SS illustrating the multiplicity of neurological symptomatology and its unpredictable course. One case is particularly unusual due to its severe neurological evolution, leading to death despite treatments. This report presents clinical and paraclinical findings contributory to SS diagnosis and offers an innovative perspective on disease management. These cases represent the potential severity of this disease. Early, aggressive treatment strategies may be warranted for SS in order to avoid neurological deterioration and lethal evolution.