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Relationship of CD4 Count to Development of Opportunistic Infections
Renal Stones
Rest and 24-Hour Redistribution Thallium-201 (201tl) Single-Photon Emission CT (Spect) Myocardial Perfusion Imaging (Mpi) of a 75-Year-Old Man with Atypical Angina Showing a Large Amount of Resting Ischemia in the Left Anterior Descending Coronary Artery (LAD)
Retinal Embolus (Arrow)
Rheumatoid Nodules over the Extensor Surface of the Forearm
Right Bundle Branch Block
Role of Cobalamin (Vitamin B12) and Folic Acid in Nucleic Acid and Myelin Metabolism
Romaña Sign
Sagittal Brain MRI in the Same Patient with Multiple Sclerosis Showing Multiple Lesions at Different Levels of the Nervous System
Scalescalp Psoriasis
Scattered Fibroglandular Tissue
Schematic Drawing of Pulmonary Stenosis
Schematic Showing Effects of Eisenmenger Syndrome on the Heart
Relative Afferent Pupillary Defect
Representative Spirograms (Upper Panel) and Expiratory Flow-Volume Curves (Lower Panel) for Normal (A), Obstructive (B), and Restrictive (C) Patterns
Retinal Changes in HIV Infection: Cytomegalovirus Retinitis with Hemorrhages and Retinal Whitening
Rheumatoid Arthritis
Right Atrial Enlargement (Rae) and Rvh
Risk Index for Material Cardiac Complications in Pregnancy (Carpreg II)
Role of Obesity in the Pathophysiology of Weight-Related Diseases
Rosacea in a 34-Year-Old Woman Showing Erythema, Papules, and Pustules Covering Much of the Face
Scabies
Scarlet Fever
Schematic Diagram of a Percutaneous Transhepatic Cholangiogram, Here Used to Provide Drainage for an Obstructing Pancreatic Carcinoma
Schematic Illustration of Upper Motor Neuron Pathways
Schistosoma Eggs
Sclerodactyly of the Hands in a Patient with Systemic Sclerosis
Secondary Syphilis Mucous Patch of the Tongue
Sensory Pathways Conveying Touch, Pressure, Vibration, Joint Position, Pain, and Temperature Sensation
Severe, Chronic Hypertensive Retinopathy with Hard Exudates, Increased Vessel Light Reflexes, and Sausage-Shaped Veins
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