Papillary thyroid carcinoma with fibromatosis-like stroma: A case report and review of the literature.

Papillary thyroid carcinoma with fibromatosis-like stroma (PTC-FLS) is a rare type of thyroid carcinoma that does not receive adequate follow-up. This study describes a case of PTC-FLS on the right side of the neck. The patient consented to a right hemithyroidectomy with a central compartment lymphadenectomy. Pathological examination revealed that the two initial lesions were consis tent with benign histological performance. Using immunohistology, the proliferated stromal cells were revealed to be positive for vimentin and smooth muscle actin (SMA), but negative for thyroglobulin, S-100 and CK. Post-operative follow-up was scheduled at 3-month intervals for 2 years and then at 6-month intervals for the next 3 years. There were no signs of tumor recurrence at the 5-year follow-up.