CT AND MRI OF AGGRESSIVE OSTEOBLASTOMA OF THYROID CARTILAGE

We present a unique case of aggressive osteoblastoma arising from thyr oid cartilage. A 52-year-old man presented with a 10 month history of neck discomfort but without frank pain. CT and MR examinations disclos ed a well defined mass arising from the thyroid cartilage. This lesion had areas of coarse calcifications and a central area of lucency. The appearance suggested chondrosarcoma. Hemilaryngectomy was performed t o remove the mass en bloc. Surgical pathology diagnosed aggressive ost eoblastoma arising from thyroid cartilage.