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| Substernal Thyroid |
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| Location |
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| • | Most (80%)
arise from lower pole or isthmus |
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| of thyroid and
extend into anterior |
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| mediastinum |
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| • | Some (20%)
arise from posterior aspect of |
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| thyroid and
extend into posterior |
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| mediastinum |
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| • | Almost always
on right |
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