What is the term for a tumor that resembles the primary tumor histologically but is located at a different site?

The term for a tumor that resembles the primary tumor histologically but is located at a different site is known as a secondary or metastatic tumor. Metastasis occurs when cancer cells spread from the original (primary) tumor to other parts of the body, forming new tumors that share similar histological characteristics. This resemblance indicates that these secondary tumors are derived from the same type of cancer as the primary tumor, even though they are located elsewhere in the body.

In contrast, primary tumors refer to the original site where the cancer develops, while malignant tumors are characterized by their ability to invade nearby tissues and spread to other parts of the body. Benign tumors, on the other hand, do not invade surrounding tissues or metastasize. They are usually well-defined and localized, lacking the aggressive behavior typical of malignant tumors. Understanding the distinction between these terms is crucial in the context of cancer diagnosis and treatment.