NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,138 terms related to cancer and medicine.

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atelectasis
(A-teh-LEK-tuh-sis)
Failure of the lung to expand (inflate) completely. This may be caused by a blocked airway, a tumor, general anesthesia, pneumonia or other lung infections, lung disease, or long-term bedrest with shallow breathing. Sometimes called a collapsed lung.