What best describes a "contiguous tumor"?

A contiguous tumor is best described as a single tumor that spreads to nearby areas. This definition is based on the concept that a contiguous tumor is not isolated but rather extends into adjacent tissues or organs. The term "contiguous" implies that the tumor is in direct contact with surrounding normal tissue and may invade into those areas, indicating local spread rather than distant metastasis.

Understanding this term is crucial in oncology, as it influences treatment decisions, prognosis, and the overall approach to managing the disease. For instance, if a tumor is contiguous, it may be considered for surgical resection along with the surrounding tissue, if feasible. In contrast, a tumor that is completely isolated does not fit this definition, as it suggests no local spread into surrounding tissues. Additionally, a tumor that has metastasized widely pertains to distant spread rather than local invasion, while a benign tumor typically does not involve invasion of surrounding tissues at all. Therefore, the definition of a contiguous tumor aligns most closely with the concept of local invasion and spread.