We report a patient with metastatic thyroid carcinoma invading the eso
phagus in whom barium and MR examinations revealed an expansile intral
uminal mass indistinguishable from that of a primary esophageal malign
ancy. Metastatic thyroid carcinoma should therefore be included in the
differential diagnosis of an expansile esophageal mass. As in our pat
ient, MR imaging may be useful for showing that the mass originates in
the thyroid gland.