目的 探讨前交叉韧带(ACL)重建术后各时间段移植物MRI信号特征,并与二次关节镜结果作对照.方法 回顾性分析39例行ACL重建术患者的移植物MRI信号特征与二次关节镜结果 ,分析两者的一致性.结果39例二次关节镜显示移植物连续性均为良好,其中紧张度良好18例,张力轻度松弛21例.术后行90例次MRI检查,按距离第一次关节镜术后时间划分:<3个月Ⅰ类信号11例次、Ⅱ类信号1例次;3～11个月Ⅰ类信号9例次、Ⅱ类信号32例次、Ⅲ类信号9例次;≥12个月Ⅰ类信号13例次、Ⅱ类信号13例次、Ⅲ类信号2例次.术后12～18个月,Ⅰ～Ⅲ类信号的患者移植物张力情况比较差异无统计学意义(P>0.05);但术后18个月以上,Ⅰ、Ⅱ类MRI信号者与关节镜所见的移植物张力情况高度一致.结论 术后3个月以内移植物基本表现为均匀低信号,术后3～11个月大部分移植物表现为线状、条纹状高信号或局限性高信号,术后12～18个月移植物MRI信号特征与实际张力情况吻合度差;>18个月移植物MRI信号与实际张力情况高度吻合.

Objective To detect the vertebral marrow fat compositions in postmenopausal women with newly diag-nosed type 2 diabetes mellitus (T2DM) assessed by MRS, and to analyze the relationships between marrow fat compositions and hemoglobin A1C (HbA1C). Methods This study included 25 (mean age, 57.4 ±4.5 years) newly diagnosed T2DM patients and 25 age-and BMI-matched healthy controls (mean age, 56.6±4.0 years) who underwent 1H-MRS scans at the L3 vertebral body. Total marrow fat content (FC) and unsaturated fat index (UFI) were measured. HbA1C and fasting plasma glucose were measured. Differences in age, body mass index (BMI), glucose, HbA1C, FC, and UFI between groups were com-pared with t-test. Associations of FC and UFI with glucose and HbA1C were tested using Pearson correlation analysis. Results There was no significant difference in FC between the T2DM women and healthy controls (63.2%±7.4%versus 60.9%±6.9%), but UFI was significantly lower in the T2DM group (6.1%±0.8%versus 7.6%±0.9%;t=-3.775, P<0.001). FC was higher in T2DM patients with HbA1C>7.0 than those with HbA1C≤7.0% (66.0%±6.3%versus 57.6%±6.5%;t=2.893, P<0.001). HbA1C value was positively correlated with FC value (r=0.801, P<0.001) and inversely associated with UFI(r=-0.746, P<0.001) in the T2DM group. No association of blood glucose with FC (r=0.226, P=0.206) and UFI(r=-0.184, P=0.589) were observed. Conclusions Vertebral marrow UFI is significantly decreased in postmenopausal women with T2DM. Marrow fat content is strongly associated with HbA1C in T2DM. MRS of spinal marrow fat may serve as a novel tool for moni-toring blood glucose control.

Objective To detect the change of vertebral marrow fat fraction (FF) using MR spectroscopy (MRS) in postmenopausal osteoarthritis (OA) women.Methods This cross-sectional study included OA patients (n=31) and healthy controls (n=22) who underwent MRS and bone density examinations.Marrow FF was calculated, and serum PINP and β-CTX levels were determined.Results Marrow FF in OA patients (58.5%±6.3%) was higher than in controls (50.2%±5.2%) (t=2.411, P<0.001).Even after adjustment for bone density, there was significant difference in marrow FF between OA and healthy control groups.Additionally, bone density, PINP and β-CTX of OA patients were higher than those of controls.Marrow FF in both OA patients and controls was negatively associated with bone density (r=-0.532 and-0.497, respectively;all P<0.001) but had no correlations with PINP and β-CTX.Conclusion Postmenopausal OA women exhibit marrow fat accumulation, which indicates OA patients have risk of fragility fractures.

Objective To investigate the MSCT manifestations and their values in the diagnosis of annular pancreas in neonates.Methods Retrospective analysis of clinical and CT findings in 27 cases with surgery-proved annular pancreas in neonates was made.The unenhanced and contrast-enhanced CT images were obtained in 20 patients.Two experienced radiologists determined the site and degree of obstruction,the relationship between the head of the pancreas and the obstruction point,and the surrounding tissue structure.Results The direct signs included the fluid-filled or gas-filled bowel in the head of pancreas in 4 cases,the enhancement of surrounding soft tissue as enhanced pancreas in 17 cases,disappearance of the fat gap between the intestinal wall and the annular pancreas in 17 cases.The indirect signs included intestinal obstruction in 20 cases," single-bubble sign" in 2 cases," double-bubble sign" in 18 cases,the distal bowel without gas in 5 cases,small amount of gas in the distal bowel in 15 cases.In 12 of 18 cases showing "double-bubble sign",the ratio of duodenal bubble diameter(Dd) to stomach bubble diameter (Ds)was over 1.0.The site of obstruction was located in the descending duodenum in 20 cases.The form of obstructed point presented with "nipple sign" in 15 cases,with "the mouse tail" in 5 cases.The expansion bowel was located in the head of pancreas in 1 case.Gas was found in the pancreatic duct in 1 case,and "swirl sign" was shown in 2 cases.Conclusions MSCT combined with three-dimensional reconstruction techniques can clearly demonstrate the annular pancreas' s shape,the site and degree of obstruction and other malformations.It can provide important information for clinical treatment.

<正>病例资料患者,女,42岁,自述左上腹痛3d,疼痛性质为持续性胀痛,并向左侧腰背部放射,伴恶心呕吐,呕吐物为胃内容物。病程中患者饮食睡眠差,大小便正常。查体:左上腹深压痛,无反跳痛及肌紧张。实验室检查肿瘤指标未见明显增高。超声:腹膜后实性占位,性质待定。上腹部CT检查示胰腺尾部见一类圆形肿块,大小约4.2cm×

<正>1病史摘要患者,女性,55岁,发作性头痛伴恶心、呕吐2个月余。2 CT检查所见右侧颞叶见大小约46 mm×53 mm×52 mm的异常密度区,密度不均匀,中央见不规则片状低密度区,增强扫描明显不均匀强化,病变内见多发扭曲、杂乱血管影,边界清晰,周围见大片水肿区,以窄基底与蝶骨翼相贴,病变主体以锐角与蝶骨翼相交,右侧基

目的 总结后部可逆性脑病综合征(PRES)的临床特点及神经影像表现.方法 回顾性分析1例PRES临床特点及神经影像表现,并复习文献.结果 PRES神经影像表现为双侧大脑后部脑白质区广泛水肿,但也可以发生在其他部位,如额叶、脑干或小脑.CT表现为白质区密度降低;MR表现为T1WI低信号,T2WI和FLAIR像显示高信号.血管源性水肿时,DWI呈中等或低信号,ADC图呈高信号;若致病因素不能有效消除,血管源性水肿也会发展成细胞毒性水肿.水肿有时会合并有新鲜微小的出血灶,CT表现为密度增高,T2WI、平面自旋回波T2WI及DWI均呈低信号.结论 通过神经影像检查,并结合病史,可以对PRES进行准确诊断.