Intrathoracic thyroid masses (goitres):
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are the most frequent cause of a superior mediastinal mass.
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The characteristic feature is that the mass extends from the superior mediastinum into the neck and almost invariably compresses or displaces the trachea.
Retrosternal goitre.
(a) X-Ray showing a large, right-sided, superior mediastinal mass displacing the trachea.
(b) CT in the same patient showing the heterogeneously enhancing mass to the right of the trachea
