A rare, slow growing, primary carcinoma of the thyroid gland characterized by a lobulated architectural pattern and the presence of a biphasic cellular population composed of spindle epithelial cells and glandular cells. A small number of cases are composed exclusively of spindle epithelial cells or glandular cells.
Synonyms:
exact_synonym:
settle; settle tumor; settle tumour; spindle epithelial tumor with thymus-like differentiation tumor; spindle epithelial tumour with thymus-like differentiation tumour