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Retinopathy of prematurity (ROP) affects blood vessels in premature babies’ eyes. Infants with more severe forms of ROP face a serious risk of blindness.

Rett syndrome is a genetic disorder that causes a loss of spoken language and motor skills, as well as behavioral and neurological problems.

Rhabdomyosarcoma is a cancerous tumor that grows in the body's soft tissues.

Rheumatic fever is a systemic immune disease that affects the joints, skin, heart, blood, vessels, and brain.

Ringworm is a skin condition characterized by a ring-shaped red, scaly rash, or patches with clearing centers.

Relative energy deficiency in sport (RED-S) happens when athletes do not get enough fuel through food to support the energy demands of their daily lives and training.

Renal artery stenosis is when one or more of the vessels carrying blood to the kidneys become narrowed.

Rotavirus is a contagious virus. Among children, it's the leading cause of severe diarrhea.

Rubella is a viral illness that results in a rash or skin eruption.

Relapsed neuroblastoma is when neuroblastoma returns in patients who have already undergone treatment for the disease. Refractory neuroblastoma is when the tumor does not respond to initial treatment.