Uncommon clinical manifestations in a case of thyroid carcinoma

A case of multiple, functional bone metastases from a previously operated follicular thyroid carcinoma is reported in an apparently euthyroid patient. Additional uncommon clinical manifestations encountered in this case were: 1) mandibular metastasis mimicking an intraoral arteriovenous malformation, 2) extensive, destructive, and expansive intraspinal metastases in the thoracic vertebral column protruding into the posterior mediastinum and causing severe spinal lesions, and 3) the precipitation of a fatal thyroid crisis following radioactive iodine treatment.