Brain tumors and cancers: a brain tumor with cancer cells is termed malignant.

• A. Benign
• B. Inflammatory
• C. Congenital
• D. Malignant

Answer: (D)

Malignant means cancerous and capable of invasion. When a brain tumor contains cancer cells, those cells invade surrounding brain tissue and can spread, which is the defining behavior of malignant tumors. Benign describes non-cancerous tumors that grow slowly and stay localized, not invading nearby tissue. Inflammatory refers to immune-related tissue reactions, not the cancer status of a tumor. Congenital means present at birth, not whether a tumor is cancerous. So a brain tumor with cancer cells is malignant because its cells exhibit cancerous behavior by invading tissue.