Medullary thyroid cancer
![](/Images/godic/202501/12/Medullary_thyroid_carcinoma_-_high_mag5505.jpg")
![Medullary thyroid carcinoma on ultrasound with typical small calcifications (arrows)](/Images/godic/202501/12/Medulaeres_SD-Ca_mit_Verkalkungen5505.jpg")
![A surgery for MTC showing the central lymph nodes and thyroid gland removed](/Images/godic/202501/12/Diagram_showing_after_surgery_for_medullary_thyroid_cancer_with_the_central_lymph_nodes_and_the_thyroid_gland_removed_CRUK_092.svg5505.png")
Medullary thyroid cancer (MTC) is a form of thyroid carcinoma which originates from the parafollicular cells (C cells), which produce the hormone calcitonin. Medullary tumors are the third most common of all thyroid cancers. They make up about 3% of all thyroid cancer cases.