Fig. 15
a Heterotopic mediastinal goitre. Sagittal contrast-enhanced CT scan demonstrates a well-defined mass (arrow) located in the retrosternal space which shows an intense and heterogeneous contrast enhancement due to the presence of cystic areas (*). No connection to the thyroid gland from the neck. b Anaplastic thyroid carcinoma in a 64-year-old woman with respiratory failure. Contrast-enhanced CT scan shows an anterior mediastinal soft tissue mass (*) which surrounds great vessels and oesophagus and compresses trachea. Note the extension to the suprasternal fossa (open arrow)