R2^(*) value derived from multi-echo Dixon technique can aid discrimination between benign and malignant focal liver lesions

BACKGROUND R2^(*)estimation reflects the paramagnetism of the tumor tissue,which may be used to differentiate between benign and malignant liver lesions when contrast agents are contraindicated.AIM To investigate whether R2^(*)derived from multi-echo Dixon imaging can aid differentiating benign from malignant focal liver lesions(FLLs)and the impact of 2D region of interest(2D-ROI)and volume of interest(VOI)on the outcomes.METHODS We retrospectively enrolled 73 patients with 108 benign or malignant FLLs.All patients underwent conventional abdominal magnetic resonance imaging and multi-echo Dixon imaging.Two radiologists independently measured the mean R2^(*)values of lesions using 2D-ROI and VOI approaches.The Bland-Altman plot was used to determine the interobserver agreement between R2^(*)measurements.Intraclass correlation coefficient(ICC)was used to determine the reliability between the two readers.Mean R2^(*)values were compared between benign and malignant FFLs using the nonparametric Mann-Whitney test.Receiver operating characteristic curve analysis was used to determine the diagnostic performance of R2^(*)in differentiation between benign and malignant FFLs.We compared the diagnostic performance of R2^(*)measured by 2D-ROI and VOI approaches.RESULTS This study included 30 benign and 78 malignant FLLs.The interobserver reproducibility of R2^(*)measurements was excellent for the 2D-ROI(ICC=0.994)and VOI(ICC=0.998)methods.Bland-Altman analysis also demonstrated excellent agreement.Mean R2^(*)was significantly higher for malignant than benign FFLs as measured by 2D-ROI(P<0.001)and VOI(P<0.001).The area under the curve(AUC)of R2^(*)measured by 2D-ROI was 0.884 at a cut-off of 25.2/s,with a sensitivity of 84.6%and specificity of 80.0%for differentiating benign from malignant FFLs.R2^(*)measured by VOI yielded an AUC of 0.875 at a cut-off of 26.7/s in distinguishing benign from malignant FFLs,with a sensitivity of 85.9%and specificity of 76.7%.The AUCs of R2^(*)were not significantly different between the 2D-ROI and VOI methods.CONCLUSION R2^(*)derived from multi-echo Dixon imaging whether by 2D-ROI or VOI can aid in differentiation between benign and malignant FLLs.

Can Emax and platelet count truly differentiate between benign and malignant liver lesions?

This letter critically evaluates Jiang et al's article on the differentiation of benign and malignant liver lesions using Emax and platelet count.Despite notable findings,significant methodological and interpretative limitations are identified.The study lacks detailed assay conditions for Emax measurement,employs inadequate statistical methods without robust multivariate analysis,and does not provide clinically relevant threshold values.The nomogram's reliance on Emax as a major diagnostic contributor is questionable due to attenuation in hepatocellular carcinoma patients with cirrhosis.Moreover,the study's limitations,such as selection bias and confounding factors,are not adequately addressed.Future research should adopt more rigorous methodologies,including prospective studies with larger cohorts and standardized protocols for biomarker measurement,to enhance validity and clinical applicability.

Focal liver lesions:Practical magnetic resonance imaging approach

With the widespread of cross-sectional imaging, a growth of incidentally detected focal liver lesions(FLL) has been observed. A reliable detection and characterization of FLL is critical for optimal patient management. Maximizing accuracy of imaging in the context of FLL is paramount in avoiding unnecessary biopsies, which may result in post-procedural complications. A tremendous development of new imaging techniques has taken place during these last years. Nowadays, Magnetic resonance imaging(MRI) plays a key role in management of liver lesions, using a radiation-free technique and a safe contrast agent profile. MRI plays a key role in the non-invasive correct characterization of FLL. MRI is capable of providing comprehensive and highly accurate diagnostic information, with the additional advantage of lack of harmful ionizing radiation. These properties make MRI the mainstay for the noninvasive evaluation of focal liver lesions. In this paper we review the state-of-the-art MRI liver protocol, briefly discussing different sequence types, the unique characteristics of imaging non-cooperative patients and discuss the role of hepatocyte-specific contrast agents. A review of the imaging features of the most common benign and malignant FLL is presented, supplemented by a schematic representation of a simplistic practical approach on MRI.

Combination of acoustic radiation force impulse imaging, serological indexes and contrast-enhanced ultrasound for diagnosis of liver lesions

AIM To assess the value of combined acoustic radiation force impulse(ARFI) imaging, serological indexes and contrast-enhanced ultrasound(CEUS) in distinguishing between benign and malignant liver lesions. METHODS Patients with liver lesions treated at our hospital were included in this study. The lesions were divided into either a malignant tumor group or a benign tumor group according to pathological or radiological findings. ARFI quantitative detection, serological testing and CEUS quantitative detection were performed and compared. A comparative analysis of the measured indexes was performed between these groups. Receiver operating characteristic(ROC) curves were constructed to compare the diagnostic accuracy of ARFI imaging, serological indexes and CEUS, alone or in different combinations, in identifying benign and malignant liver lesions. RESULTS A total of 112 liver lesions in 43 patients were included, of which 78 were malignant and 34 were benign. Shear wave velocity(SWV) value, serum alpha-fetoprotein(AFP) content and enhancement rate were significantly higher in the malignant tumor group than in the benign tumor group(2.39 ± 1.20 m/s vs 1.50 ± 0.49 m/s, 18.02 ± 5.01 ng/m L vs 15.96 ± 4.33 ng/m L, 2.14 ± 0.21 d B/s vs 2.01 ± 0.31 d B/s; P < 0.05). The ROC curve analysis revealed that the areas under the curves(AUCs) of SWV value alone, AFP content alone, enhancement rate alone, SWV value + AFP content, SWV value + enhancement rate, AFP content + enhancement rate and SWV value + AFP content + enhancement rate were 85.1%, 72.1%, 74.5%, 88.3%, 90.4%, 82.0% and 92.3%, respectively. The AUC of SWV value + AFP content + enhancement rate was higher than those of SWV value + AFP content and SWV value + enhancement rate, and significantly higher than those of any single parameter or the combination of any two of parameters.CONCLUSION The combination of SWV, AFP and enhancement rate had better diagnostic performance in distinguishing between benign and malignant liver lesions than the use of any single parameter or the combination of any two of parameters. It is expected that this would provide a tool for the differential diagnosis of benign and malignant liver lesions.

Benign liver tumors in pediatric patients-Review with emphasis on imaging features

Benign hepatic tumors are commonly observed in adults,but rarely reported in children.The reasons for this remain speculative and the exact data concerning the incidence of these lesions are lacking.Benign hepatic tumors represent a diverse group of epithelial and mesenchymal tumors.In pediatric patients,most benign focal liver lesions are inborn and may grow like the rest of the body.Knowledge of pediatric liver diseases and their imaging appearances is essential in order to make an appropriate differential diagnosis.Selection of the appropriate imaging test is challenging,since it depends on a number of age-related factors.This paper will discuss the most frequently encountered benign liver tumors in children(infantile hepatic hemangioendothelioma,mesenchymal hamartoma,focal nodular hyperplasia,nodular regenerative hyperplasia,and hepatocellular adenoma),as well as a comparison to the current knowledge regarding such tumors in adult patients.The current emphasis is on imaging features,which are helpful not only for the initial diagnosis,but also for pre- and posttreatment evaluation and follow-up.In addition,future perspectives of contrast-enhanced ultrasound(CEUS) in pediatric patients are highlighted,with descriptions of enhancement patterns for each lesion being discussed.The role of advanced imaging tests such as CEUS and magnetic resonance imaging,which allow for non-invasive assessment of liver tumors,is of utmost importance in pediatric patients,especially when repeated imaging tests are needed and radiation exposure should be avoided.

Hepatic focal nodular hyperplasia in children:Imaging features on multi-slice computed tomography

AIM:To retrospectively analyze the imaging features of hepatic focal nodular hyperplasia(FNH) in children on dynamic contrast-enhanced multi-slice computed tomography(MSCT) and computed tomography angiography(CTA) images.METHODS:From September 1999 to April 2012,a total of 218 cases of hepatic FNH were confirmed by either surgical resection or biopsy in the Sun Yat-sen Memorial Hospital of Sun Yat-sen University and the Cancer center of Sun Yat-sen University,including 12 cases(5.5%) of FNH in children(age ≤ 18 years old).All the 12 pediatric patients underwent MSCT.We retrospectively analyzed the imaging features of FNH lesions,including the number,location,size,margin,density of FNH demonstrated on pre-contrast and contrastenhanced computed tomography(CT) scanning,central scar,fibrous septa,pseudocapsule,the morphology of the feeding arteries and the presence of draining vessels(portal vein or hepatic vein).RESULTS:All the 12 pediatric cases of FNH had solitary lesion.The maximum diameter of the lesions was 4.0-12.9 cm,with an average diameter of 5.5 ± 2.5 cm.The majority of the FNH lesions(10/12,83.3%) had well-defined margins.Central scar(10/12,83.3%) and fibrous septa(11/12,91.7%) were commonly found in children with FNH.Central scar was either isodense(n = 7) or hypodense(n = 3) on pre-contrast CT images and showed progressive enhancement in 8 cases in the equilibrium phase.Fibrous septa were linear hypodense areas in the arterial phase and isodense in the portal and equilibrium phases.Pseudocapsule was very rare(1/12,8.3%) in pediatric FNH.With the exception of central scars and fibrous septa within the lesions,all 12 cases of pediatric FNH were homogenously enhanced on the contrast-enhanced CT images,significantly hyperdense in the arterial phase(12/12,100.0%),and isodense in the portal venous phase(7/12,58.3%) and equilibrium phase(11/12,91.7%).Central feeding arteries inside the tumors were observed on CTA images for all 12 cases of FNH,whereas no neovascularization of malignant tumors was noted.In 9 cases(75.0%),there was a spoke-wheel shaped centrifugal blood supply inside the tumors.The draining hepatic vein was detected in 8 cases of pediatric FNH.However,the draining vessels in the other 4 cases could not be detected.No associated hepatic adenoma or hemangioma was observed in the livers of the 12 pediatric cases.CONCLUSION:The characteristic imaging appearances of MSCT and CTA may reflect the pathological and hemodynamic features of pediatric FNH.Dynamic multi-phase MSCT and CTA imaging is an effective method for diagnosing FNH in children.

Malignant transformation of hepatocellular adenoma in a young female patient after ovulation induction fertility treatment:A case report

BACKGROUND Hepatocellular adenoma(HCA) is a rare benign liver tumor usually affecting young women with a history of prolonged use of hormonal contraception.Although the majority is asymptomatic, a low proportion may have significant complications such as bleeding or malignancy. Despite responding to the hormonal stimulus, the desire for pregnancy in patients with small HCA is not contraindicated. However, through this work we demonstrate that intensive hormonal therapies such as those used in the treatment of infertility can trigger serious complications CASE SUMMARY A 33-year-old female with a 10-year history of oral contraceptive use was diagnosed with a hepatic tumor as an incidental finding in an abdominal ultrasound. The patient showed no symptoms and physical examination was unremarkable. Laboratory functional tests were within normal limits and tests for serum tumor markers were negative. An abdominal magnetic resonance imaging(MRI) was performed, showing a 30 mm × 29 mm focal lesion in segment VI of the liver compatible with HCA or Focal Nodular Hyperplasia with atypical behavior. After a total of six years of follow-up, the patient underwent ovulation induction treatment for infertility. On a following MRI, a suspected malignancy was warned and hence, surgery was decided. The surgical specimen revealed malignant transformation of HCA towards trabecular hepatocarcinoma with dedifferentiated areas. There was non-evidence of tumor recurrence after three years of clinical and imaging follow-up.,CONCLUSION HCAs can be malignant regardless its size and low-risk appearance on MRI when an ovultation induction therapy is indicated.

高频超声造影在浅表肝脏局灶性病变检出及诊断中的临床价值

目的探讨高频超声造影(CEUS)在浅表肝脏局灶性病变(FLLs)检出及诊断中的临床价值。方法选取我院浅表FLLs患者38例,共63个病变,分别使用低频凸阵探头和高频线阵探头对患者进行CEUS检查,比较低频CEUS与高频CEUS在病变可见度评分、检出率和良恶性鉴别诊断中的差异。结果浅表FLLs在高频CEUS下平均可见度评分和检出率分别为(3.62±0.79)分、93.7%(59/63),均显著高于低频CEUS[(2.44±1.04)分、57.1%(36/63)],差异均有统计学意义(均P<0.05)。高频CEUS对最大径≤1 cm FLLs、最大径1~2 cm FLLs和肝转移瘤的检出率均显著高于低频CEUS[96.7%(29/30)vs.46.7%(14/30)、92.6%(25/27)vs.66.7%(18/27)、100%(26/26)vs.57.7%(15/26)],差异均有统计学意义(均P<0.001)。高频CEUS鉴别诊断浅表FLLs良恶性的灵敏度、准确率分别为92.9%、91.7%,均高于低频CEUS(78.6%、77.8%),差异均有统计学意义(均P<0.05)。结论高频CEUS在提高浅表FLLs的检出率和定性诊断方面均有明显优势,具有重要的临床价值。

超声造影对局灶性睾丸病变诊断价值的meta分析

目的系统评价超声造影(contrast-enhanced ultrasound,CEUS)对局灶性睾丸病变的诊断价值。方法检索PubMed、Embase、Cochrane Library、Web of Science、中国生物医学文献数据库(CBM)、中国知网(CNKI)、万方、维普(VIP)数据库,收集从建库至2023年8月10日发表的关于CEUS诊断局灶性睾丸病变的相关文献,根据纳入和排除标准筛选文献、提取数据,并行文献质量评价,采用RevMan5.4、Meta disc1.4及Stata15.0软件分析CEUS在睾丸肿瘤与肿瘤样病变、肿瘤良恶性两个方面的诊断效能。结果最终纳入13篇文献共712个病灶。Meta分析结果显示,CEUS诊断睾丸肿瘤与肿瘤样病变的合并敏感度、特异度、阳性似然比、阴性似然比分别为0.95(95%CI:0.87~0.98)、0.84(95%CI:0.73~0.91)、5.8(95%CI:3.3~10.2)、0.06(95%CI:0.02~0.17),合并受试者工作特征曲线下面积为0.94(95%CI:0.92~0.96);CEUS诊断睾丸良恶性病变的合并敏感度、特异度、阳性似然比、阴性似然比分别为0.95(95%CI:0.85~0.99)、0.81(95%CI:0.65~0.90)、4.9(95%CI:2.5~9.6)、0.06(95%CI:0.02~0.20),合并受试者工作特征曲线下面积为0.96(95%CI:0.94~0.97)。结论CEUS对局灶性睾丸病变具有较高的诊断价值,能为临床诊疗提供参考。

超声造影联合B超对良恶性肝脏病变的鉴别及诊断效能分析

目的:探讨超声造影联合B超对良恶性肝脏病变的鉴别及诊断效能。方法:选取2019年12月—2023年12月徐州医科大学附属医院收治的60例肝脏病变患者为研究对象,全部患者均接受B超与超声造影检查,以病理学检查结果为金标准分为肝癌组与良性病变组,比较良恶性病变的超声征象以及超声造影联合B超对肝癌的诊断效果。结果:肝癌组峰值强度高于良性病变组,造影剂到达时间、达峰时间与拟合曲度尖度低于良性病变组,差异有统计学意义(P<0.05);良性病变组28例形态规则,26例边界清晰,25例内部呈低回声;肝癌组2例形态规则,3例边界清晰,6例内部呈低回声,两组超声征象比较,差异有统计学意义(P<0.05);超声造影联合B超诊断肝癌的准确度为93.33%,灵敏度为92.86%,特异度为93.75%均高于两者单一检查,其中联合与B超单一检查比较,差异有统计学意义(P<0.05)。结论:超声造影联合B超可有效鉴别良恶性肝脏病变,相较于单一B超检查,可提升肝癌的诊断效能。

超声弹性成像与二维超声在肝脏病灶良恶性病变中的对比研究

目的探讨超声弹性成像(ultrasound elastography,UE)与二维超声在肝脏病灶良恶性病变中的应用价值。方法选取2012年6月-2014年6月沧州市中心医院收治的168例肝病患者,术前对患者行UE及常规超声检查,并将影像学诊断结果与病理手术结果进行对比。结果 168例患者中,经病理确诊为良性病变68例、恶性病变82例、无病理性改变18例。二维超声诊断良、恶性病变敏感度、特异度、准确度分别为82.35%、88.89%、83.72%和79.27%、72.22%、78.00%;UE诊断良、恶性病变敏感度、特异度、准确度分别为91.18%、88.89%、90.70%和95.12%、88.89%、94.00%。与良性病变患者相比,恶性病变患者弹性成像分级较高,差异有统计学意义(P<0.05)。结论 UE技术为肝脏病变诊断及鉴别提供了全新的方法,提高了肝脏良恶性病变的诊断准确性及灵敏性。

57例肝脏少见良性占位病变的回顾性分析

目的分析肝脏少见良性占位病变的病历资料,探讨诊断经验。方法回顾性分析华中科技大学同济医学院附属协和医院肝胆外科近十年经术后病理证实的57例肝脏少见良性占位病变的临床资料。结果多数患者无明显的既往史,无或者轻度具有临床症状和实验室指标异常,24例有典型影像学表现,但只有6例肝局灶性结节增生患者得到了正确的术前诊断。结论部分肝脏少见良性病变在CT和MR动态扫描下具有特征性影像学表现,遵循诊治流程,完善常规检查,掌握疾病特点,可提高术前确诊率。

1.2 ml声诺维在肝脏占位病变超声造影中的作用探讨

目的初步探讨1.2 ml声诺维在肝脏占位病变超声造影检查中的应用价值。方法选取51例使用1.2 ml声诺维(1.2 ml组)和83例使用2.4 ml声诺维(2.4 ml组)行肝脏占位病变超声造影的患者,比较两组超声造影动脉相血流灌注的主要增强方式,对比肝脏良恶性占位病变的时间-强度曲线(TIC)形态特征,分析肝脏占位病灶与周围肝实质血流灌注参数,包括始增时间(AT)、达峰时间(TTP)、上升时间(Δt)、本底强度(Ib)、峰值强度(Ip)、增强强度(ΔI)及ΔI/Δt,以及两组肝脏占位病灶血流灌注参数的差异。结果两组声诺维超声造影下恶性和良性占位病变的主要增强方式相同,恶性占位病变的增强方式主要为整体型和周边增强型,TIC波峰较尖锐。1.2 ml组肝脏占位病变与周围肝实质AT、TTP、Δt、Ib、Ip、ΔI/Δt比较差异均有统计学意义(均P<0.05)。与2.4 ml组比较,1.2 ml组周围肝实质和肝占位病变的AT、TTP、Ib差异均有统计学意义(均P<0.05),1.2 ml组肝血管瘤的TIC参数仅AT差异有统计学意义,肝癌(原发性肝细胞癌和转移性肝癌)的TIC参数仅Ib差异有统计学意义(均P<0.05)。结论使用1.2 ml声诺维行超声造影检查可以较好地显示肝脏占位病变,特别是对肝癌和肝血管瘤的显示,具有较好的临床应用价值。

声晕及血管分布对脂肪肝局灶性脂肪缺失与肝脏恶性病变鉴别的价值

目的探讨声晕、血供特征的多普勒超声特征对非均匀性脂肪肝局灶性脂肪缺失与类似于局灶性脂肪缺失的肝脏恶性病变的鉴别价值。方法回顾性分析2012年1月至2015年8月期间在我院超声科检查的47例肝脏局灶性恶性病变患者的58个类似于局灶性脂肪缺失肝脏恶性病变病灶和52例脂肪肝患者的52个非典型非均匀性脂肪肝局灶性脂肪缺失的多普勒超声特征。以声晕、内部血供和血流速度为参数评价其在分析非均匀性脂肪肝局灶性脂肪缺失中的敏感性、特异性、准确性、阳性预测值、阴性预测值。结果肝脏恶性病变的声像特征有声晕、较多血管和血流信号较丰富,脉冲多普勒检测有动脉血流,而非均匀性脂肪肝局灶性脂肪缺失很少探及动脉血流,二者静脉分布数都少。区分二者时,以有声晕、有较多血管和探及动脉血流为肝脏恶性病变判断标准,无声晕、有较少血管或无血管、探及不到动脉血流为肝局灶性脂肪缺失(良性病变)判断标准。结果显示,58个肝脏恶性病变病灶中有13个符合良性或良性可能,45个符合恶性或恶性病变可能;52个非典型非均匀性脂肪肝局灶性脂肪缺失中13个符合占位性病变或占位性病变可能,36个符合脂肪肝局灶性脂肪缺失。以有声晕、有较多血管和有动脉血流存在为恶性病变参照标准鉴别恶性与良性(低脂肪灶)病变,则其敏感性为81.69%、特异性为79.03%、准确性为80.45%、阳性预测值为81.69%、阴性预测值为79.03%。结论出现于无恶性病变危险因素的脂肪肝患者肝脏中无声晕及无动脉血流的可疑病变可能是不典型局灶性脂肪缺失或其他病变,为肝癌或转移癌的可能性较小。有无声晕及有无动脉血流对不典型局灶性脂肪缺失与恶性病变鉴别有一定价值。

超声造影与彩色多普勒超声在肝肿瘤诊断中的对比

目的探讨超声造影与彩色多普勒超声在肝肿瘤诊断中的临床价值。方法选取80例肝肿瘤患者,先行彩色多普勒超声检查,然后注入造影剂,进行超声造影检查。通过观察2种检测手段的血流信号分级,各类型肝肿瘤的诊断结果及肝脏良恶性病变的最大流速(Vmax)和阻力指数(RI)值,对比超声造影与彩色多普勒超声在肝肿瘤诊断中的临床价值。结果超声造影对HCC的血流显示率为88.0%,彩色多普勒超声对HCC血流显示率为68.0%,超声造影的血流显示率明显较高(P<0.05);2种检测方法在MLC,HHA的血流显示率上相比,无统计学差异(P>0.05)。以病理诊断结果为金标准,超声造影对各类型肝脏肿瘤的诊断准确率高于彩色多普勒超声诊断的准确率(P<0.05)。采用彩色多普勒超声与超声造影测得的肝脏良恶性病变Vmax相比,无统计学差异(P>0.05)。采用彩色多普勒超声与超声造影测得肝癌的RI均要高于肝脏良性病变(P<0.05),但2种检测方法间RI值相比,无统计学差异(P>0.05)。结论超声造影可以较为准确地检测肝肿瘤,对肿瘤内血流信号敏感度和特异性较高,也能较好地区分肝脏良恶性病变,具有较好的临床应用价值。

肝局灶结节性增生的影像学特征及临床病理观察

目的:探讨肝局灶结节性增生(FNH)的临床及影像学特点、病理形态、免疫组织化学特征及鉴别诊断。方法:分析9例FNH的临床资料及发病特点、影像学特征、组织病理形态及免疫表型、细胞角蛋白(CK8/18、CK7)、CD34、甲胎蛋白和Ki-67的表达。并进行相关文献复习。结果:影像学观察FNH通常为孤立的结节,平扫为等密度或稍低密度,中央可见低密度瘢痕。FNH病理大体表现为境界清楚、中央有纤维瘢痕的结节性肿块。镜下纤维间隔将肝组织分割成大小不等、形状不规则的结节,可见厚壁血管及增生的小胆管。免疫组织化学染色CK8/18、CK7结节内和周边增生的小胆管阳性表达;CD34结节内的血窦内皮细胞及纤维间隔的血管内皮细胞阳性表达。甲胎蛋白结节内增生胆管和肝细胞均阴性,Ki-67阳性指数较低。结论:FNH是对畸形血管的肝细胞反应性增生,是一种良性瘤样病变,对于诊断明确的无症状者手术切除后,可定期随诊或复查。

低剂量超声造影联合血清微小RNA-106b鉴别肝脏良、恶性占位性病变的价值

目的探讨低剂量超声造影联合血清微小RNA-106b(microRNA-106b,miR-106b)在肝脏良、恶性占位性病变诊断中的价值。方法对2017年2月至2019年10月在乐山市人民医院治疗的肝脏占位性病变患者120例进行回顾性分析,根据患者的病理结果分为良性病变组(57例)和恶性病变组(63例)。所有患者均给予低剂量超声造影检查,并采用实时荧光定量聚合酶链式反应检测血清miR-106b的相对表达量。采用受试者工作特征(receiver operator characteristic,ROC)曲线分析低剂量超声造影联合血清miR-106b对肝脏良、恶性病变的鉴别价值。结果恶性病变组患者血清miR-106b相对表达量为2.01±0.72,显著高于良性病变组的1.06±0.41,差异有统计学意义(t=8.988,P <0.001)。恶性病变患者超声造影特征中早增强[89.47%(51/57)vs 19.05%(12/63)]、高增强[70.18%(40/57)vs 33.33%(21/63)]和快消退[73.68%(42/57)vs6.35%(4/63)]比例均显著高于良性病变组(χ~2=59.518、16.252、57.397,P均<0.001)。低剂量超声造影联合血清miR-106b鉴别诊断肝脏良、恶性病变的ROC曲线下面积为0.959,显著高于血清miR-106b及低剂量超声造影的0.868、0.877(z=7.495、7.115,P均<0.001)。结论低剂量超声造影联合血清miR-106b水平在肝脏良、恶性占位性病变的诊断中有较好的应用价值。

1.5T超导型全身MRI弥散加权成像用于诊断肝脏良恶性病变临床价值分析

目的探讨与分析磁共振弥散加权成像用于诊断肝脏良恶性病变临床价值。方法 120例肝脏占位性病变者(232个病灶)分别采用1.5T磁共振扫描仪扫描检查,然后选取不同b值进行DWI成像及高分辨T2加权成像,测量ADC值。结果使用低b值时,肝脏各种占位性病变ADC值差异有统计学意义(P<0.05);中b值及高b值时,肝脏良恶性病变ADC值差异有统计学意义(P<0.05);高b值时,肝癌和肝转移瘤与正常肝组织ADC值差异有统计学意义(P<0.05)。结论通过比较肝脏占位性病变的DWI图像特点及ADC值的不同范围,可准确的判断病变的性质,对肝脏占位性病变的良、恶性判断有较大的价值,瘤/肝比对原发性肝癌及肝转移瘤的鉴别具有一定意义。

超声造影在脾局灶性病变诊断中的应用价值

目的探讨超声造影(Contrast Enhanced Ultrasound,CEUS)在脾局灶性病变良恶性诊断中的应用价值。方法对47例脾局灶性病变进行CEUS,分析CEUS的图像特点,并与最终诊断进行比较。结果在34位患者的47例病灶中,良性病变有29例,恶性病变有18例。CEUS对脾局灶性病变良恶性的诊断敏感度、特异度、精确度分别为96.5%、100%、97.8%;常规超声的敏感度、特异度、精确度分别为79.3%、72.2%、76.6%。造影剂"快出"增强模式在脾良恶性病变中差异具有统计学意义(P<0.05)。结论 CEUS对脾局灶性病变良恶性的鉴别具有重要价值。

DWI序列ADC值鉴别前列腺良恶性局灶性病变的价值

目的:探讨弥散加权成像(DWI)序列表观弥散系数(ADC)值鉴别前列腺良恶性局灶性病变的价值。方法:选取2019年1月至2022年11月在我院治疗的前列腺带病变患者105例,其中恶性病变患者59例,良性病变患者46例,分析良恶性病灶ADC值差异,同时分析ADC值与恶性病变临床病理的关系。结果:恶性病灶ADC值为(0.81±0.13)×10^(-3)mm^(2)/s,低于良性病灶(P<0.05);中高危病灶ADC值为(0.75±0.16)×10^(-3)mm^(2)/s,低于低危病灶(P<0.05);临床分期C期和D期病灶ADC值分别为(0.76±0.15)×10^(-3)mm^(2)/s和(0.72±0.14)×10^(-3)mm^(2)/s,低于B期病灶(P<0.05);不同年龄、体质量指数、病灶直径、病理类型组ADC值比较差异无统计学意义(P>0.05);恶性病灶ADC值与Gleason评分呈负相关(r=-0.343,P<0.05);ADC值判断恶性病灶的ROC曲线下面积为0.912(95%CI:0.839~0.986),P<0.05,截断值为0.99×10^(-3)mm^(2)/s,其灵敏性和特异性分别为86.10%和92.80%。结论:DWI序列ADC值鉴别前列腺良恶性局灶性病变有较高的诊断价值,同时ADC值与严重程度、临床分期有关。