Renal Artery Stenosis Riboflavin (Vitamin B2) Respiratory Distress Syndrome Retinopathy of Prematurity Rashes Retropharyngeal Abscess Rheumatic Fever Respiratory Tract Infections Roseola Infantum Rotavirus Infection Rubella Retinoblastoma Rett's Disorder Rabies Rabson-Mendenhall Syndrome Radiation Syndromes Ramsay-Hunt Syndrome Rapid-Onset Obesity, Hypothalamic Dysfunction, Hypoventilation, and Autonomic Dysregulation Rapp Hodgkin Syndrome Raynaud's Disease and Phenomenon Recurrent Respiratory Papillomatosis Reflex Sympathetic Dystrophy Syndrome Refractory Sprue Refsum Disease Reiter's Syndrome Relapsing Polychondritis Renal Agenesis, Bilateral Renal Glycosuria Respiratory Distress Syndrome, Infant Restless Legs Syndrome Retinitis Pigmentosa Retinoblastoma Retinopathy of Prematurity Retinopathy, Arteriosclerotic Retinopathy, Diabetic Retinopathy, Hypertensive Retinoschisis Retroperitoneal Fibrosis Rett Syndrome Reye Syndrome Rh Disease Rheumatic Fever Rickets, Vitamin D Deficiency Rieger Syndrome Roberts Syndrome Robinow Syndrome Rocky Mountain Spotted Fever Romano Ward Syndrome Rosai-Dorfman Disease Rosenberg Chutorian Syndrome Roseola Infantum Rothmund Thomson Syndrome Roussy Levy Syndrome Rubella, Congenital Rubella Rubinstein Taybi Syndrome Russell Silver Syndrome (RSS) Ruvalcaba Syndrome