Abstract
Thyroid paragangliomas are rare tumors that arise from the inferior laryngeal paraganglia. Most patients are female and present with an asymptomatic thyroid nodule. Histologically, the tumor is composed of cells arranged in a well-defined nest (zellballen) pattern surrounded by a thin fibrovascular stroma. It is a diagnostic pitfall and is occasionally misdiagnosed as follicular neoplasm, medullary thyroid carcinoma, intrathyroid parathyroid proliferation, and especially secondary neuroendocrine tumors. Immunohistochemical stains (cytokeratin, parathyroid hormone, thyroid transcription factor 1, tyrosine hydroxylase, chromogranin A, synaptophysin, S100, calcitonin, carcinoembryonic antigen) are essential in establishing the diagnosis. Loss of succinate dehydrogenase complex, subunit B (SDHB), immunoexpression can be used to triage genetic testing because some mutations are associated with a higher risk for developing metastasis. Total thyroidectomy or lobectomy for solitary lesion is the preferred treatment. Elective lymph node dissection is usually not indicated. Postoperatively, patients should receive hormonal evaluation for functional disease and imaging for evaluation of multifocal or metastatic disease.
摘要
甲状腺副神经节瘤是起源于喉下副神经节的少见肿瘤。
患者多为女性,表现为无症状的甲状腺结节。
组织学上,肿瘤细胞排列成境界清楚的巢状(zellballen模式),周围绕以纤细的纤维血管间质。可被误诊为滤泡性肿瘤、甲状腺髓样癌、甲状腺内甲状旁腺增生,尤其易误诊为继发性神经内分泌肿瘤。
免疫组化染色(CK、PTH、TTF-1、tyrosine hydroxylase、CgA、synaptophysin、S100、CT、CEA)对于诊断很重要。SDHB免疫组化表达缺失可用于筛选出需基因检查的病例,因为有些突变与高转移风险相关。
孤立性病变首选甲状腺全切或叶切除。通常不需要选择性淋巴结切除。
术后患者应进行激素检测评价有无功能性疾病,并进行影像学检测评价有无多灶性或转移性疾病。
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