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目的 了解骶骨肿瘤的CT和MRI表现特征。方法 分析 69例骶骨肿瘤的CT和MRI表现 ,包括动脉瘤样骨囊肿(ABC)、骨母细胞瘤、骨肉瘤各 1例 ,骨髓瘤 2例 ,淋巴瘤 3例 ,骨巨细胞瘤 5例 ,脊索瘤 2 3例 ,转移瘤 33例。结果 骨巨细胞瘤位于椎体和前部附件 ,呈溶骨性破坏 ;ABC位于后部附件 ,MRI有液 -液平面 ;骨母细胞瘤和骨肉瘤CT呈骨性密度 ,MRI信号较低 ,后者伴软组织肿块 ;2 2例脊索瘤伴骶前包块 ,1 1 / 1 6例CT上出现钙化 ,9例在T2 WI有条状低信号纤维结构和高信号粘液基质。骨髓瘤 (1例 )、淋巴瘤和转移瘤在T1 WI和T2 WI分别呈略低信号和较高信号 ,1例骨髓瘤在T2 WI呈较高信号。结论 CT和MRI可清楚地显示肿瘤的部位和范围 ,两者结合 ,多数肿瘤可以定性
Objective To understand the CT and MRI features of sacral tumors. Methods The CT and MRI findings of 69 sacral tumors were analyzed including 1 aneurysmal bone cyst (ABC), osteoblastoma and osteosarcoma, 2 myeloma, 3 lymphoma, 5 giant cell tumor of bone, Chordoma 23 cases, 33 cases of metastases. Results The giant cell tumor of bone was located in the vertebral body and the anterior appendage and was osteolytic. ABC was located in the posterior appendage and MRI had liquid-liquid level. CT of osteoblastoma and osteosarcoma showed bone density with low MRI signal, The latter with soft tissue mass; 2 cases of chordoma with presacral mass, 1/1 6 cases of calcification on CT, 9 cases of T2 WI with low signal fiber structure and high signal mucus matrix. Myeloma (1 case), lymphoma and metastases showed slightly lower signal and higher signal on T1WI and T2WI, respectively, and one case of myeloma showed higher signal on T2WI. Conclusion CT and MRI can clearly show the location and extent of the tumor, the combination of the two, the majority of tumors can be qualitative