381.Aneurysmal bone cyst

每天朗读一段医学影像学英语文章

Figure 6A. Axial T2W fat-sat FSE image of the pelvis.

A cystic mass is seen within the right ilium containing several fluid-fluid levels.

Figure 6B. Coronal T2W fat-sat FSE image of the pelvis. The expansile cystic mass within the right iliac bone is redemonstrated.

Diagnosis:  Aneurysmal bone cyst.

Discussion:  Fluid-fluid levels on an MR image of an expansile lytic bone lesion were once thought to be pathognomonic for an aneurysmal bone cyst. However, multiple lesions have since been shown to contain fluid levels, including telangiectatic osteosarcomas and chondroblastomas. Fluid-fluid levels occur secondary to dependent stagnant blood products that layer within these dilated spaces. The blood products shorten the T2 relaxivity of the lesion and result in areas of relative T2 hypointensity.

Notes：

1. ilium /'ɪlɪəm/ /ˈɪliəm/ n. 髂骨

2. pathognomonic /ˌpæθəgnə(ʊ)'mɒnɪk/ /pə,θɑgnə'mɑnɪk/ adj. 特殊(病征)的,特定的,(病征)能确定诊断的

3. telangiectatic /ti,lændʒi'el'tætik/ /ti,lændʒi'el'tætik/ 毛细血管扩张的

4. osteosarcoma /ˌɒstɪəʊsɑː'kəʊmə/ /ˌɑstiosɑr'komə/ n. 骨肉瘤

5. chondroblastoma 软骨母细胞瘤

6. stagnant /'stægnənt/ /'stægnənt/ adj. 停滞的

来源：每天朗读一段医学影像学英语文章

圈主

深圳市人民医院放射科副主任医师杨敏洁

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