PMC6434302_01
(a) Multiple axial sections of CT scan showing retrosternal extension of thyroid mass. (b) Axial section showing inferior end of mass lying over the arch of aorta.
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fig1
Computed tomography scan was done which showed large, well circumscribed, multinodular goiter with extension of right lobe and isthmus to superior mediastinum with a size of 8.8 x 6.5 x 4.5 cm (Figure 1).
PMC6434302_02
CT scan demonstrating retrosternal extension of thyroid mass in a sagittal and a coronal section.
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fig2
A computed tomography scan was done which showed enlarged thyroid with multiple internal calcifications and retrosternal extension up to the level of ascending aorta with multiple collateral vascular channels around mass lesion in anterior mediastinum (Figure 2).
Intraoperative image showing the cervical portion of thyroid mass. Another mass is seen below which is intrathoracic, retrosternal, and separately encapsulated.
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fig3
The mediastinal component was also large and separately capsulated from cervical component, extending up to the arch of aorta and superior vena cava with compression of brachiocephalic vein (Figure 3).