An unusual tumor of the mediastinum:  thyroid cyst.
D003560:Cysts; D006801:Humans; D008479:Mediastinal Neoplasms; D008482:Mediastinum; D009369:Neoplasms; D011230:Precancerous Conditions; D013961:Thyroid Gland
CYSTS; MEDIASTINUM/neoplasms