title: Merged histological types of malignant thyroid tumor: experience and controversy.
abstract: Malignant tumors of the thyroid that consist of merged histological types are a rare clinical entity, with an obscure pathogenesis and no consensus of opinion on nomenclature. Eight patients with merged histological types of thyroid malignant tumor at a single medical center were enrolled between January 1977 and December 2009. These patients were surgically treated and were followed postoperatively from 1 month to 34 years. Preoperative patient characteristics, B-type ultrasonography, computed tomography scan, thyroid function tests, postoperative pathology, immunohistochemistry, and prognosis data were collected. Merged histological types of thyroid malignant tumor accounted for 0.12% of all thyroid malignant tumors treated during this period. Preoperative imageology and laboratory data have no specific value toward diagnosis of merged histological types of thyroid malignant tumor. Merged histological types of thyroid carcinoma that had undergone radical resection in combination with hormonal therapy and I(131) radiotherapy achieved a satisfactory outcome, while other merged thyroid malignant tumors were usually associated with a poor prognosis. Prognosis depended on the highest grade among an individual group of malignant tumors.
authors.affiliation: Department of Thyroid & Neck Tumor, Cancer Hospital, Tianjin Medical University, Huanhu West Road, Hexi District, Tianjin 300060, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Huang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000970:Antineoplastic Agents / Q000627:therapeutic use; D002648:Child; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018193:Neoplasms, Complex and Mixed / Q000401:mortality / Q000473:pathology* / Q000628:therapy*; D011379:Prognosis; D011878:Radiotherapy; D013934:Thymectomy; D013964:Thyroid Neoplasms / Q000401:mortality / Q000473:pathology* / Q000628:therapy*
chemical_list: D000970:Antineoplastic Agents