Mixed medullary–follicular carcinoma is an uncommon tumor of the thyroid. It is characterized by histological and immunohistochemical features of both follicular and parafollicular C cells. We report a case of medullary carcinoma of the thyroid in a 26 year old female, which on light microscopy, showed not only the well known arrangement of cells in sheets and nests, but also unequivocal follicular structures. Precise diagnosis of mixed medullary-follicular carcinoma is essential for accurate treatment and follows.
Key words: Thyroid, mixed medullary-follicular carcinoma.
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