目的：对照病理，探讨甲状腺微小乳头状癌（PTMC）的声像图特征。方法：回顾性分析106例病例中122个病灶的超声图像特征及相应组织病理学表现。结果：63.9%病灶边界不清，其余边界清楚；少部分病灶有囊变（2.5%）；30.3%有晕征；近一半的病灶有微钙化（45.9%）；60%病灶评分为3分或3分以上。病灶内乳头结构和纤维间质的比例决定了病灶的回声。边界清楚的晕征与纤维假包膜相关。微钙化的病灶内可发现砂砾体。结论：PTMC的声像图特征与组织病理学特点相符，边界不清、低回声、微钙化、弹性评分≥3对PTMC的诊断具有重大意义。

Objective: To observe the imaging appearances of ultrasound in papillary thyroid microcarcinoma(PTMC), correlated with the histopathologic findings. Methods: The US results from 106 cases of PTMC with 122 nodules and correlated the results with the histopathologic findings were retrospectively evaluated. Results: The 63.9% of the PTMC nodules had an ill-defined boundary and the remaining had a well-defined boundary. A few(2.5%) of the PTMC nodules had a cystic element. The 30.3% of the nodules had a halo sign. Microcalcification was present in approximately half of the PTMC nodules. The rate of ultrasonic elastography(UE)≥3 is 60%. The amount of papillary structure and the fibrous stroma in the cancerous tissue determined the echogenicity of the nodule. A halo sign with a well-defined boundary was associated with the presence of an intact fibrous pseudo-capsule. Psammoma bodies were detectable on US as microcalcifications. Conclusion: The ultrasound findings of PTMC are correlated with its histopathological category. The “ill-defined boundary”, “hypoecho”, “microcalcification”, “ultrasonic elastography(UE)≥3” are useful for the diagnosis of PTMC.