Tumor or tumour literally means "swelling", and is sometimes still used with that meaning. Tumor meaning swelling is one of the five classical characteristics of inflammation. However, the term is now primarily used to denote abnormal growth of tissue. This growth can be either malignant or benign. It is similar in meaning to a neoplasia.

Gestational Trophoblastic Tumors - Malignant cells grow in the uterus in the tissues that are formed following conception.
NCI: Gestational Trophoblastic Tumor - Information about gestational trophoblastic tumor, a rare cancer formed during conception. Includes staging, prognosis, recurrence, and treatment options.
Meta Description: [ Expert-reviewed information summary about the treatment of gestational trophoblastic tumors. ]