CT scanning and complete excision of giant thyroid goiter in posterior mediastinum. (A) Enhanced CT scanning reveals the right thyroid lobe (in red arrow) with a small cyst and a giant goiter (in blue arrow) in low density is on the back of the right lobe. (B) CT clavicle cross section reveals the giant goiter was located in the posterior mediastinum, compressing the trachea and esophagus. (C) CT of the chest reveals the goiter is well beyond the aortic arch and compressing the superior vena cava. (D) CT of the chest reveals the lower edge of the goiter reachs the carina of trachea. (E) The tumor is in a complete capsule with large tension, 10.0 × 9.0 × 9.0 cm in size.