[Cervical and mediastinum haematoma secondary to spontaneous thyroid rupture].

We present a case of spontaneous haemorrhage of a thyroid nodule with diffusion of the haematoma to cervical spaces and mediastinum, which began as a progressive cervical mass affecting the airway and which required surgical treatment for control. The diagnosis was made using ultrasonography and cervicothoracic CT scan, giving high quality images to determine the site of bleeding as well as the extent of the process.