Secondary retrosternal goitre derives its blood supply from :
Secondary retrrosternal goitre : Is the extension of thyroid tissue to mediastinum from thyroid in the neck. and it derives blood supply from thyroid vessels.
Primary retrrosternal goitre : Is the ectopic thyroid tissue in the mediastinum and it derives blood supply from mediastinal vessels.
Mediastinal vessels
Thyroid vessels
Arch of aorta
Bronchial vessels