Bronchoalveolar carcinoma affects cells located near the lung's air sacs (alveoli) or the windpipes that branch off the trachea and supply each lung with air (bronchi). Because they are a sub-type of adenocarcinoma, malignant bronchoalveolar carcinoma cells usually line the outside of internal organs. Most cases of bronchoalveolar carcinoma are found on the peripheral parts of the lungs, which is a general term for the area outside the central area of the lungs closest to the trachea. Although bronchoalveolar carcinoma in non-invasive, it can spread (metastasize) throughout the lungs. However, it does not usually spread outside the lungs like many other cancers.
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