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| Substernal Thyroid |
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| X-ray-1 |
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| • | Sharply
defined, smooth or lobulated soft |
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| tissue mass |
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| • | Characteristically
displaces trachea |
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| • | Usually do not
project below arch of aorta |
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| • | Differentiates
them from thymomas and |
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| teratomas |
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