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Narcolepsy is a chronic brain disorder that causes severe daytime sleepiness.

Nephrotic syndrome (NS) is the name given to a collection of kidney-related findings in your child’s body.

Neuroendocrine tumors, also known as NETs, are growths that develop from specialized, hormone-producing neuroendocrine tissue distributed throughout the body.

Opsoclonus-myoclonus syndrome happens when a small tumor or a viral infection triggers the immune system to attack the nervous system.

Oromandibular limb hypoplasia is a group of rare conditions that involve congenital malformations of the tongue and jawbones.

Os odontoideum happens when a separation occurs at the top of the spine.

Ovarian cysts are fluid-filled sacs that usually dissolve after ovulation and can cause pain, but most often go away on their own.

Obstructive sleep apnea (OSA) is when a child’s breathing is repeatedly blocked during sleep.

Oligodendrogliomas are low-grade gliomas, a type of brain tumor, that arise from a type of cell called an oligodendrocyte.

An omphalocele is a congenital abnormality in which some of the abdominal organs of an infant protrude through an opening in the muscles near the umbilical cord.