Neuroma: A neuroma (plural: neuromata or neuromas) is a growth or tumor of nerve tissue. Neuromas tend to be benign (i.ACR score for rheumatoid arthritis: ACR score is a scale to measure change in rheumatoid arthritis symptoms. It is named after the American College of Rheumatology.MicrochimerismRheumatoid factor: Rheumatoid factor (RF) is the autoantibody (antibody directed against an organism's own tissues) that was first found in rheumatoid arthritis. It is defined as an antibody against the Fc portion of IgG (an antibody against an antibody).Borderline lepromatous leprosy: Borderline lepromatous leprosy is a skin condition with numerous, symmetrical skin lesions.Street elbow: A street elbow (sometimes called a street ell or service ell) is a type of plumbing or piping fitting intended to join a piece of pipe and another fitting at an angle. The difference between a street elbow and a regular elbow is the nature of the connections on either end.