Objective: To evaluate the diagnostic value and clinical applications of ultrasound on neonatal sacrococcygeal teratoma. Methods:A retrospective analysis of 36 patients with GE E8 ultrasonography examination of the newborn sacrococcygeal teratoma sonographic control pathology results, and pathological sonographic features were analyzed. Results: pathological results, 26 cases of benign and malignant in 10 cases. In the group of patients with benign sonographic manifestations of cystic 18 cases, seven cases of mixed, solid one case;in cases of malignant sonographic manifestations of cystic one case, mixed four cases of malignant 5 cases. Benign cystic teratoma or ultrasound showed more mixed, form more regular, visible signs of lipid stratification. Malignant dominated mostly solid performance for not only the whole interior wall echo clutter, tumor boundary is not clear. Conclusion:With the increase in the real component of malignant tumor, the greater the likelihood of ultrasonography helps newborns to identify benign and malignant sacrococcygeal teratoma.%目的：探讨超声影像对新生儿骶尾部畸胎瘤的诊断价值和临床应用。方法：回顾性分析36例经超声诊断仪检查的新生儿骶尾部畸胎瘤的超声声像图，对照病理诊断结果与超声声像图及病理表现的特点进行对比分析。结果：病理结果显示为良性26例，恶性10例，在良性组病例中，超声声像图表现为囊性18例，混合性7例，实性1例；在恶性组病例中，超声声像图表现为囊性1例，混合性4例，恶性5例。良性畸胎瘤超声表现多为囊性或混合性，形态较规则，可见脂质分层征；恶性多以实性为主，表现为囊壁不光整、内部回声杂乱以及肿瘤边界不清晰。结论：随着畸胎瘤实性成分的增多，肿瘤的恶性可能性也越大，超声检查有助于新生儿骶尾部畸胎瘤良性及恶性的鉴别。
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