Sakorafas George H, Giotakis John, Stafyla Vania
Department of Surgery, 251 Hellenic Air Force Hospital, Arkadias 19-21, GR-11526 Athens, Greece.
Cancer Treat Rev. 2005 Oct;31(6):423-38. doi: 10.1016/j.ctrv.2005.04.009. Epub 2005 Jul 6.
Papillary thyroid microcarcinoma (PTMC) is defined as a papillary thyroid cancer measuring less than 10mm in its greatest diameter. It is the most common form of thyroid cancer, detected in up to 36% in autopsy studies. The wide availability and use of neck ultrasonography in the evaluation of carotid arteries and of the thyroid resulted in an increased detection of PTMC. PTMC is often multifocal. The diagnosis is usually based on a combination of clinical examination, laboratory investigations, and specialized radiological techniques (mainly neck ultrasonography combined with fine-needle aspiration cytology). A common scenario is the diagnosis of PTMC as an incidental finding following thyroidectomy for a presumably benign thyroid disease. Despite some controversy, most authors agree that PTMC should be treated by total or near-total thyroidectomy, provided it can be performed safely. Because of its many and major advantages, in our clinical practice, total or near-total thyroidectomy is the procedure of choice for the management of PTMC. Given the high incidence of PTMC as an incidental finding and the frequent multi-focality, we also favor total or near-total thyroidectomy for the surgical management of nodular thyroid disease (multinodular goiter or dominant presumably benign thyroid nodule/s). Despite some controversy, we perform central neck lymph node dissection electively, in the presence of cervical lymphadenopathy. Radioiodine ablation therapy may be used as an adjuvant therapy. Prognostic factors (such as tumor multicentricity, positive lymph nodes, capsular or vascular invasion) or scoring systems (such as the AMES) can be used to select patients for radioiodine adjuvant therapy. Suppression therapy is needed after surgical management. Despite the potential for neck lymph node and even distant metastases, the biological behavior of PTMC is in general benign and the prognosis is very good.
甲状腺微小乳头状癌(PTMC)被定义为最大直径小于10mm的乳头状甲状腺癌。它是甲状腺癌最常见的形式,在尸检研究中检出率高达36%。颈部超声在评估颈动脉和甲状腺时广泛应用,导致PTMC的检出率增加。PTMC常为多灶性。诊断通常基于临床检查、实验室检查和专业放射学技术(主要是颈部超声联合细针穿刺细胞学检查)相结合。常见情况是在因疑似良性甲状腺疾病行甲状腺切除术后偶然发现PTMC。尽管存在一些争议,但大多数作者一致认为,只要能安全进行手术,PTMC应采用全甲状腺切除或近全甲状腺切除术治疗。由于其诸多主要优点,在我们的临床实践中,全甲状腺切除或近全甲状腺切除术是治疗PTMC的首选术式。鉴于PTMC偶然发现的高发生率和频繁的多灶性,我们也倾向于对结节性甲状腺疾病(多结节性甲状腺肿或优势性疑似良性甲状腺结节)进行全甲状腺切除或近全甲状腺切除术。尽管存在一些争议,但在有颈部淋巴结肿大的情况下,我们选择性地进行中央区颈部淋巴结清扫。放射性碘消融治疗可作为辅助治疗。预后因素(如肿瘤多中心性、阳性淋巴结、包膜或血管侵犯)或评分系统(如AMES)可用于选择接受放射性碘辅助治疗的患者。手术治疗后需要进行抑制治疗。尽管PTMC有颈部淋巴结甚至远处转移的可能,但其生物学行为总体呈良性,预后非常好。