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The CT images demonstrate a well-defined ovoid hypodense mass within the posterosuperior mediastinum at T2-T3 level with peripheral enhancement following IV contrast, compressing and displacing the trachea and oesophagus anteriorly. No regional lymphadenopathy was noted. No pulmonary lesion was seen on lung window.
The thyroid gland appears small in size (atrophied), inhomogeneous on postcontrast images (patient treated for hypothyroidism).