A<unk>  is a tumor that lacks all three of the malignant properties of a cancer. Thus, by definition, a<unk> :
Common examples of<unk> s include moles and uterine fibroids.
The term<unk> " implies a mild and nonprogressive disease, and indeed, many kinds of<unk>  are harmless to the health. However, some neoplasms which are defined as<unk> s' because they lack the invasive properties of a cancer, may still produce negative health effects. Examples of this include tumors which produce a "mass effect" (compression of vital organs such as blood vessels), or "functional" tumors of endocrine tissues, which may overproduce certain hormones (examples include thyroid adenomas, adrenocortical adenomas, and pituitary adenomas).<unk> s typically are encapsulated, which inhibits their ability to behave in a malignant manner.  Nonetheless, many types of<unk> s have the potential to become malignant and some types, such as teratoma, are notorious for this.
Benign tumor
Vascular tissue neoplasm
Vascular tumor
Tumor
Space occupying lesion
Spontaneous process
Hematological malignancy
Malignant transformation