A<unk>  () is a type of abnormal and excessive growth of tissue. The process that occurs to form or produce a<unk>  is called<unk> a. The growth of a<unk>  is uncoordinated with that of the normal surrounding tissue, and persists in growing abnormally, even if the original trigger is removed. This abnormal growth usually forms a mass, when it may be called a tumor. ICD-10 classifies<unk> s into four main groups: benign<unk> s, in situ<unk> s, malignant<unk> s, and<unk> s of uncertain or unknown behavior. Malignant<unk> s are also simply known as cancers and are the focus of oncology. Prior to the abnormal growth of tissue, as<unk> a, cells often undergo an abnormal pattern of growth, such as metaplasia or dysplasia. However, metaplasia or dysplasia does not always progress to<unk> a and can occur in other conditions as well. The word is from Ancient Greek νέος-<unk>  'new' and πλάσμα plasma 'formation, creation'.
Neoplasm
Pterygium (conjunctiva)
Cancer cell
Intestinal pseudo-obstruction
Biomedical tissue
Baker's cyst
Calculus 
Tietze syndrome  Tietze syndrome  1