This image shows a rib cage with lungs and heart inside with the outline of where a larger cross section of the lungs, heart, and pleura are located. The larger cross section is below, showing the lobes of the lungs with their tops sliced off to reveal the pleura which wraps around the lungs. Like a deflated balloon, the single layer of the pleura acts as two, wrapping around the lung and sliding against itself to ease the movement of the lung as a person inhales and exhales.

The headline of the image is Pleura: Pleural Mesothelioma. The text reads: Surrounding the lungs, the pleura is a membrane that allows to the lungs to slide easily against the thoracic cavity and other organs as they expand and contract. Cancer of the pleura is known as pleural mesothelioma.

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