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| Discussion : Intrathoracic Goiter =extension of cervical thyroid tissue / ectopic thyroid tissue (rare) into mediastinum Incidence: 5% of resected mediastinal masses; most common cause of mediastinal masses Location: usually anterior, 25% posterior exclusively on right side -mostly asymptomatic -symptoms of tracheal + esophageal + recurrent laryngeal nerve compression -continuity with cervical thyroid / lack of continuity (with narrow fibrous / vascular pedicle) -mass of high HU + well-defined borders -frequent focal calcifications -inhomogeneous texture with low-density areas (= degenerative cystic areas) -marked + prolonged enhancement |
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