Yes, every malignant tumor is considered to be cancerous. Malignant tumors are defined as abnormal cell growths that have the potential to spread to neighboring tissues or organs, and potentially other parts of the body. These tumors can be either solid or liquid, and are generally made up of cancerous cells that have grown in an uncontrolled manner. Malignant tumors are considered to be cancerous because they contain cells that are capable of invading and damaging other nearby tissues, as well as potentially spreading to other parts of the body.
It is important to note that not all tumors are malignant. Benign tumors are also types of abnormal cell growths, but they are not considered cancerous. These tumors are generally non-aggressive, meaning that they do not spread to other parts of the body. Benign tumors may still require medical attention, but they are not as serious as malignant tumors.
In summary, every malignant tumor is considered to be cancerous because it contains cells that have the potential to spread to other tissues or organs, and potentially to other parts of the body. Benign tumors, on the other hand, are not considered to be cancerous because they are generally non-aggressive and do not spread.