A novel association of osmotic demyelination in Sjögren's syndrome prompts revisiting role of aquaporins in CNS demyelinating diseases: A literature review

•Novel association of osmotic demyelination syndrome in Sjögren's syndrome.•Osmotic demyelination, not neuromyelitis optica spectrum disorder associated with renal tubular acidosis.•Osmotic demyelination syndrome in Sjögren's associated with hypokalaemia and/or hypernatremia but not hyponatremia.•Aquaporin defects may be implicated in the pathogenesis of osmotic demyelination syndrome in Sjögren's syndrome.