儿童骶尾部卵黄囊瘤的CT和MRI诊断

【目的】提高对儿童骶尾部卵黄囊瘤的CT和MRI表现的认识。【方法】回顾性分析16例经手术和病理证实的儿童骶尾部卵黄囊瘤的临床表现和CT、MRI征象。【结果】16例均表现骶尾部软组织肿块，边缘不规整，密度／信号不均匀，常见出血及程度不同坏死囊变区，无脂肪成分；增强扫描肿块表现为明显不均匀强化，其中5例可见条状血管样强化，1例可见蜂窝状强化。2例肿块部分伸入椎管，骶骨受侵犯。16例卵黄囊瘤AFP均升高。【结论】骶尾部卵黄囊瘤的CT和MRI表现有一定特点，结合血清AFP检测可以提高术前诊断的准确性。

CT and MRI Diagnosis of Sacrococcygeal Yolk Sac Tumors in Children

Objective]To study the CT and MRI findings of saerococeygeal yolk sac tumors in children. Methods]Clinical, CT and MRI features in 16 cases with saerococcygeal yolk sac tumors confirmed by surgery and pathology were reviewed retrospectively. Results]The tumors appeared as soft-tissue masses and their margins were uneven. The density and signal of the tumor was heterogeneous in all cases and often associated with hemorrhage, necrotic and cystic change area in different extend. There was no fat in all cases. Contrastenhanced scan displayed obviously heterogeneous enhancement and showed blood vessels enhancement in 5 cases and alveolate enhancement in 1 case. Two sacrococcygeal yolk sac tumors were extended into the canalis vertebralis and sacrum was invasive. Serum AFP level of 16 yolk sac tumors increased. Conclusion] Sacrory coccygeal yolk sac tumors have some CT and MRI features. CT and MRI combined with serum AFP examination can improve the accuracy of preoperative diagnosis.