This tumor may represent a hitherto unrecognized group of NUTM1 fusion-positive, high-grade thyroid carcinomas that exhibit distinctive features of swirling nodular growth of squamoid cells around micro-proliferated blood vessels, prominent colloid production, nuclear features overlapping with papillary thyroid carcinoma in an intermingled subset of tumor cells, and a thyrocyte immunophenotype. Here, NUTM1 is linked to differentiated thyroid carcinoma.