Chronic atrophic polychondritis. Axial positron emission tomography (PET) and computed tomography (CT) scans through the chest of a 56-year-old man with chronic atrophic polychondritis (CAP). The PET scan is at left, the CT scan is at centre, and a combined CT-PET scan is at right. These scans (at the level of the lungs and heart) show the bronchial junction. CAP is a rare systemic disease of unknown cause. It attacks the cartilages of the body, such as in the ear, larynx or trachea. The location of a lesion is shown by the red lines, displaying as a bright signal at upper left and a red area at upper right.
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