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Paragangliomas and pheochromocytomas are tumors that develop out of the neuroendocrine tissue responsible for making epinephrine.

Rabies is a viral infection of certain warm-blooded animals (such as skunks, raccoons, foxes, coyotes, and bats) and is caused by a virus in the Rhabdoviridae family.

Radioulnar synostosis is a rare condition in which the two bones of the forearm — the radius and the ulna — are abnormally connected.

Raynaud’s phenomenon is when a child’s blood vessels react in an exaggerated way to cold or stress.

Red blood cell (RBC) disorders are conditions that affect red blood cells, the cells of blood that carry oxygen from the lungs to all parts of the body.

A child is in respiratory distress when he or she has difficulty breathing.

Respiratory syncytial virus (RSV) is a viral organism that can cause upper and lower respiratory tract infections.

Retinoblastoma is a rare childhood cancer of the eye. It arises from the retina.

Rectal prolapse occurs when the lining of a child's rectum protrudes through the anus and outside the body.

Radial longitudinal deficiency (radial club hand) is a rare condition that affects the forearm.