儿童脂肪瘤及脂肪母细胞瘤的CT及MRI表现

目的：探讨儿童脂肪瘤及脂肪母细胞瘤的CT及MRI的特点。材料和方法：回顾性分析45例经病理证实的脂肪瘤及脂肪母细胞瘤患儿的CT及MRI表现，观察并比较肿块的最大径，脂肪所占肿瘤体积的百分比，是否有钙化，是否有间隔及分隔的厚度，是否有非脂肪软组织影及生长方式。结果：脂肪瘤35例，男20例，女15例，平均4.6岁。脂肪瘤肿瘤最大径平均为8.7cm。脂肪组织占肿瘤体积的百分比为90%~99％。肿瘤内有分隔的8例，分隔厚度为1~5mm。肿瘤内见非脂肪的结节状软组织影7例，结节状软组织占肿瘤体积的百分比为2%~10％。边界清晰29例。经病理证实的脂肪母细胞瘤10例，男6例，女4例，平均年龄1.7岁。肿瘤最大径平均为5.2cm。脂肪组织占肿瘤体积的百分比为70%~90％。有钙化2例。肿瘤内有分隔的10例，分隔厚度为3~10mm。肿瘤内见不规则结节状或团块状软组织影8例，软组织占肿瘤体积的百分比为10%~30％。边界清晰7例。结论：根据患儿的年龄及肿瘤CT及MRI的特点，脂肪瘤与脂肪母细胞瘤做出明确的诊断。

CT and MRI of lipoma and lipoblastoma in children

Objective: To review the reliability of CT and MRI features of lipoma and lipoblastoma. Materials and Methods: CT and MRI of 35 cases of lipoma and 10 cases of lipoblastoma were retrospectively reviewed. Images were assessed for adipose tissue content, nonadipose component, presence of septa, the thickness of septa, presence of calcification and the growth pattern. Results: Features that suggest lipoblastoma include presence of thick septa, presence of nodular and or globular or nonadipose masslike areas, and decreased percentage of fat composition. Conclusion: CT and MRI features are reliable to distinguish lipoma and lipoblastoma.