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Figure 20a.   Pulmonary hamartoma in a 74-year-old woman. (a) Chest CT scan obtained with 10-mm collimation demonstrates a nodule (arrow), but its internal morphologic features are poorly visualized. (b) Thin-section CT scan obtained with 1-mm collimation better demonstrates a punctate area of fat within the nodule (arrow), a finding that is diagnostic for hamartoma.