NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,863 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

Surgery to remove a whole lobe (section) of an organ (such as the lungs, liver, brain, or thyroid gland).

EnlargeLobectomy; drawing shows lobes of both lungs, trachea, bronchi, bronchioles, and lymph nodes. Cancer is shown in one lobe. The removed lobe is shown next to the lung from which it was removed.

Lobectomy. A lobe of the lung is removed.