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Jarcho-Levin syndrome is a rare genetic disorder characterized by distinctive malformations of bones of the spinal column (vertebrae) and the ribs, respiratory insufficiency, and/or other abnormalities.here are apparently two forms of Jarcho-Levin Syndrome that are inherited as autosomal recessive genetic traits and termed spondylocostal dysostosis type 1 (SCDO1) and spondylocostal dyostosis type 2 (SCDO2).
Recurrent conditions like Kleine-Levin syndrome, which is characterized by at least yearly bouts of excessive sleepââ (at least 11 hours a day and up to days at a time) that are accompanied by debilitating mood and behavior changes, are also a type of primary hypersomnia. In other words, the cause is unknown.