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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.

Oppositional defiant disorder is one of the commonly diagnosed disruptive behavior disorders in children and adolescents.

An optic nerve glioma (also called an optic pathway glioma) is a slow-growing brain tumor that arises in or around the optic nerve, which connects the eye to the brain.

Orbital cellulitis and periorbital cellulitis are inflammation and infection of the tissue and skin surrounding the eye.

Osgood-Schlatter disease is an overuse condition or knee injury that causes a painful bump and swelling on the shinbone.