Aggressive cribriform‐morular variant of papillary thyroid carcinoma: Report of an unusual case with pulmonary metastasis displaying poorly differentiated features

The cribriform‐morular variant of papillary thyroid carcinoma (CMV‐PTC) is a rare morphologic entity in which metastasis rarely occurs. Until now, only three cases of metastasis by CMV‐PTC have been reported. We present a rare sporadic case of CMV‐PTC with multiple lung metastases in a 28‐year‐old female, 3 years after total thyroidectomy. The lung tumor was not encapsulated but well‐circumscribed and showed a mixture of cribriform, papillary,...