Thyroid carcinoma showing thymic-like differentiation (CASTLE) comprises a rare neoplasm of the thyroid gland which arises from ectopic thymic tissue or remnants of brachial pouches. CASTLE is regarded as an indolent neoplasm with a favorable prognosis. irrespective of its metastatic potential. Diagnosis is difficult as clinicopathological features have not been yet well-defined. https://www.animationbengal.com/