A malignant tumor of the ovary (or just about any other organ) is a tumor that has become much worse. This tumor is one that might have become invasive to the point of destroying a given organ. Or it may have "thrown off cells" and metastasized, relocating in another organ or organs.
Whatever the diagnosis, the response should be an aggressive medical workup and a full disclosure of the severity of the situation. It should then follow that a full list of possible treatment options is given to the patient. All of the aspects of diagnosos and treatment should be explained sufficiently to allow a patient (and his/her advisors) to make decisions about a treatment plan.
The medical term for a malignant tumor of the thyroid is thyroid carcinoma.
Osteosarcoma is a malignant tumor of osteoblasts.
Chondrosarcomachondrosarcomachondrosarcoma
hepatoma
A malignant tumour means that it is a tumour which has cancer
lymphoma
Myosarcoma
sarcoma
Cancer is the medical term meaning malignant and invasive tumor.
Neoplasm is the medical term meaning tumor; a neoplasm can be malignant (cancerous) or benign.
A malignant tumour of epithelial origin is called a carcinoma.
malignant melanoma