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Liver hypodensity on a CT scan is caused by a variety of factors, according to Radiopaedia, such as benign and malignant neoplasms, focal nodular hyperplasia, focal fatty infiltration, benign epithelial cysts, cysts caused by liver disease and infection, pyogenic abscesses, fungal abscesses, amoebic abscesses, vascular infarctions, lacerations, old ...
Orexin, also called hypocretin, is a neuropeptide that regulates arousal, wakefulness, and appetite. The most common form of narcolepsy, in which the sufferer briefly loses muscle tone (cataplexy), is caused by a lack of orexin in the brain due to destruction of the cells that produce it.