A tumor that is classified as malignant is described as: October 4, 2022 by 8i9x6 a disorganized mass that is not encapsulated and can invade nearby organs. a slow-growing, organized mass of encapsulated cells. usually confined to the skin. an area of swelling that shows no abnormal growth of cells. See Answer a disorganized mass that is not encapsulated and can invade nearby organs.