What is a primary concern regarding malignant tumors?

• A. They are fully contained within a capsule.
• B. They do not metastasize.
• C. They can invade other tissues and organs.
• D. They resemble healthy cells closely.

Answer: (C)

The major concern regarding malignant tumors is their ability to invade surrounding tissues and organs. This invasiveness characterizes malignant tumors and distinguishes them from benign tumors, which are typically well-defined and encapsulated, preventing them from spreading into nearby structures. Malignant tumors not only invade adjacent tissues but also have the potential to metastasize, meaning they can break away from the primary tumor, travel through the bloodstream or lymphatic system, and establish secondary tumors in distant sites of the body. This characteristic contributes significantly to their severity and the challenges associated with treatment.

Other options present characteristics that are misleading in the context of malignancy. For instance, malignant tumors are usually not contained within a capsule, unlike benign tumors, which often are. Additionally, the assertion that malignant tumors do not metastasize is fundamentally inaccurate, as metastasis is a hallmark of malignancy. Lastly, while some malignant tumors might exhibit features that resemble healthy cells, a true hallmark is their abnormal behavior and structure that often deviate significantly from normal tissue, particularly in aggressive forms of cancer.