Mature cystic teratoma
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CT shows a large homogeneous fluid density well-defined mass (3-12 HU), with a thin wall (1-2 mm), and thin septa. There are small areas of fat and calcium density at the wall. It has peripheral enhancement on post-contrast images. No free fluid.
An adolescent female has a large homogeneous fluid density well-defined mass, with thin wall, thin septa, along with macroscopic fat and calcium density at the wall. These findings are typical of mature cystic teratoma.
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