Extensive Osseous Metaplasia With Mature Bone Formation of Thyroid Gland

Multinodular goiter is a disease frequently encountered in endocrine surgery. Although histopathological examination of the thyroid gland often reveals fibrosis, calcification, degenerative and cystic changes, and hemorrhagic tissue, osseous metaplasia is a very rare phenomenon in the thyroid gland. We present a case of multinodular goiter with histological osseous metaplasia and mature bone formation in a 65 years old female patient.