The Collaborative International Dictionary of English v.0.48:
malignant neoplasm \malignant neoplasm\ n. (Med.), Same as malignancy[4]. Syn: malignancy, malignance, malignant tumor, metastatic tumor. [WordNet 1.5]WordNet (r) 3.0 (2006):
malignant neoplasm n 1: a tumor that is malignant and tends to spread to other parts of the body [syn: malignant tumor, malignant neoplasm, metastatic tumor]