A mass of abnormal tissue that resembles normal tissues in structure, but which fulfills no useful function (to the organism) and grows at the expense of the body. Tumors may be malignant or benign. Malignant tumors (which infiltrate adjacent healthy tissues) can result from oncogenes and/or carcinogens. They eventually kill their host if unchecked.
Generally any abnormal swelling of the body other than those caused by direct injury is considered a tumor.
A neoplasm.
General term for any abnormal mass that results from excessive multiplication of cells for unknown, though much examined causes; also called a neoplasm. The term tumor is sometimes applied in a very general way to any swelling or enlargement due to inflammation.
Growth of tissue characterized by uncontrolled cell proliferation. A tumor may be benign or malignant; localized or invasive.
A new abnormal growth of tissue in which the reproduction of cells is uncontrolled and escalating. Typically, the more rapid the growth, the more abnormal the cells. Tumors, also called neoplasms, can be benign or malignant. Benign tumors, such as warts and moles, are clumps of cells that resemble the tissue from which they develop but have reproduced and multiplied faster than normal. The cells of benign tumors never spread to other parts of the body.
Any abnormal swelling in or on a part of the body. The term is usually applied to an abnormal growth of tissue, which may be benign or malignant.
A swelling or enlargement; one of the four classic signs of inflammation.
An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. They may be benign (not cancerous) or malignant (cancerous).
Single mutated cell that continues to divide, eventually forming clusters of abnormal cells.
An atypical formation of tissue caused by the unregulated and progressive proliferation of cells.
A growth or lump formed by cells or tissues that expand independently of the host’s natural growth regulations. It progresses relentlessly, with its cause often unknown, and in its malignant state, its expansion is only constrained by the nutrients supplied by the host.