Malignancy refers to the presence of cancerous cells that have the ability to spread to other sites in the body (metastasize) or to invade nearby (locally) and destroy tissues. Malignant cells tend to have fast, uncontrolled growth and do not die normally due to changes in their genetic makeup. Malignant cells that are resistant to treatment may return after all detectable traces of them have been removed or destroyed.

Malignant neoplasms are cancerous tumors that develop when cells grow and divide more than they should. Malignant neoplasms can spread to other parts of the body and are likely to invade other parts of the body. Benign tumors, on the other hand, are noncancerous and usually grow slowly and don’t spread.

Malignant tumors form when cancerous cells multiply and develop into a mass. Unlike benign tumors, cancer cells may invade nearby tissue and break off from tumors and spread to other parts of the body. They also grow faster than benign tumors.

In summary, malignancy refers to the presence of cancerous cells that have the ability to spread to other sites in the body or to invade nearby and destroy tissues. Malignant tumors are cancerous and can invade nearby tissue and spread to other parts of the body, while benign tumors are noncancerous and usually grow slowly and don’t spread.