[Extraosseous osteosarcoma of the thyroid gland].

Extraosseous osteosarcomas are very rare malignant neoplasms that have been published in 300 cases so far. Manifestation within the thyroid gland was described in 6 cases only. We report a 69 year old female who suffered from enlarged recurrent struma after primary resection and radiotherapy 5 years ago. Histology revealed a high grade extraosseous osteosarcoma. Presenting the patient's clinical, radiological and histological findings the therapeutical options of this rare tumor entity are discussed.