Focal hepatic lesions: Detection by dynamic and delayed computed tomography versus short TE/TR spin echo and fast field echo magnetic resonance imaging

Eighteen patients with focal hepatic lesions were evaluated with two computed tomographic (CT) techniques including dynamic sequential bolus contrast CT and delayed contrast CT, and 3 magnetic resonance (MR) techniques including a spin echo pulse sequence with TE/TR of 21/310 msec and 2 fast field echo sequences using a TE/TR of 15/300 msec and 80° flip angle (T1-weighted) and TE/TR of 15/500 msec and 10–20° flip angle (T2-weighted). We concluded that CT, using delayed contrast and dynamic sequential bolus contrast techniques, was consistently superior to the 3 MR pulse sequences used on our imagers in terms of number of lesions detected, lesion-to-liver contrast, and quality of scan.     

鼠肝MR成像技术参数探讨

探寻大白鼠肝脏MR成像序列及参数。材料和方法:采用GE0.5T Veetra MR成像仪匹配的SE序列,选择不同大小的像素及TR、TE进行MR成像,然后根据图像的解剖结构图像的均一性,伪影信噪比(SNR),对比噪声比(CNR),和对癌灶的显示,判断图像的优劣,分析不同的成像参数对图像的影响。结果:像素为0.491mm(成像孔径11cm,成像矩阵224×128)时,T_1加权图像的SNR,CNR及优质率分别为17.851±1.774,14.333±3.152,及77.78％(7/9),T_2加权图像的SNR,CNR及优质率分别为8.851±2.518,7.435±1.096及77.78％(7/9);像素为0.351mm(成像孔径9cm,成像矩阵256×160)时,T_1加权图像的SNR,CNR及优质率分别为9.207±1.644,8.203±0.657,及20％(1/5),T_2加权图像SNR,CNR及优质率分别为5.961±1.326,4.463±0.590及20％(1/5)。前者明显后者(P<0.05)。TR 2000ms图像的清晰度和对癌灶显示能力较TR 1500,2500ms为好;TE 30ms,80ms较60ms,120ms好。结论:T_1加权像(TR 480ms,TE 21ms),T_2加权像(TR 2000ms,TE 30/80ms)像素0.491mm是GE0.5T Vectra鼠肝MR成像较为理想的成像参数。     

MRI of Budd-Chiari syndrome

A retrospective study was undertaken to reassess the various magnetic resonance imaging (MRI) features of Budd-Chiari syndrome (BCS). MRI examinations of 22 patients with pathologically confirmed BCS were studied. Spin-echo (SE) T1- (TR = 300–450 ms/TE = 12–15 ms), and SE T2-weighted (TR = 1600–2000 ms/TE = 30–60/90–120 ms) MRI images were obtained in all patients. Gradient-recalled-echo (GRE) images (TR = 7–60 ms/TE = 3–19 ms, flip angle = 10–40°) were obtained in 14 patients. MRI showed thrombosis of three or two hepatic veins in 19 (86%) and 3 (14%) patients, respectively. Spontaneous intrahepatic anastomoses was depicted in five (23%) patients. Ascites appeared in 15 patients (68%). Thrombosis or external compression of the inferior vena cava (IVC) by an enlarged caudate lobe was depicted in six (27%) and five (23%) patients, respectively. Prominent azygos and hemiazygos veins were demonstrated in seven (32%) patients (six of whom had thrombosis of the IVC). MRI showed hepatomegaly in all patients and enlarged caudate lobe in 18 (82%) patients. SE T1- and SE T2-weighted MRI images revealed inhomogeneous signal intensity of hepatic parenchyma in 14 (64%) patients. SE T1- and SE T2-weighted MRI images showed homogeneous signal intensity of hepatic parenchyma in eight (36%) patients. Our results demonstrate that BCS displays various features on MRI images, and such information is important for diagnosis.     

皮下应用HSA-Gd-DTPA的磁共振淋巴造影初步研究

目的初步探索皮下应用HSA-Gd-DTPA的磁共振淋巴造影的正常磁共振表现及信号强度一时间曲线。方法健康新西兰兔10只，体重2．0～2．5kg。仰卧位固定兔子，轴位和矢状位扫描双侧胭窝淋巴结。平扫序列包括T1WI、脂肪抑制T1WI和T2WI。增强扫描：平扫后双侧后肢趾蹼间隙各注射0．5ml0．20mmolGd／L的HSA-Gd-DTPA后第3、6、12、24和48h行T1WI和T1WIFS扫描。相关参数与平扫时相同。测量增强前后淋巴结的信号强度并计算淋巴结的强化率（EO），用以绘制胭窝淋巴结的信号强度-时间曲线。结果淋巴结平扫时呈T1WI等信号、T2WI高信号；增强扫描时淋巴结和淋巴管呈明显均匀强化。增强后第3小时，T1WI和T1WIFS像上胭窝淋巴结的E％分别为40．7％和42．8％，在第6小时，分别为75．60和79．7％。最大强化出现在第24小时，E％分别为215．4％和232．40A。至第48小时，胭窝淋巴结的E％仍接近1000。结论皮下间隙应用HSA-Gd-DTPA12～48h内的MR淋巴造影可清晰显示淋巴结和淋巴管，有望用于淋巴系统疾病的影像评估。     

Liver lesion detection: Comparison between excitation-spoiling fat suppression and regular spin-echo at 1.5T

The role of excitation-spoiling fat suppression (fatsat) imaging in the detection of liver lesions was assessed comparing short TR/TE and long TR/ TE spin-echo (SE) sequences with and without excitation-spoiling fat suppression in 25 patients at 1.5T. The study included patients with liver metastases (n = 21), primary liver cancer (n=3), and hepatic adenoma (n=1). Liver lesion detection and lesionliver signal-to-noise ratios (SNR) were determined for the various imaging sequences in a prospective fashion. Liver lesion-liver SNR were highest for long TR/TE (2000-2500/70-80) fatsat images (12.7±4.8) compared to long TR/TE regular SE (2000-2500/70-80) images (8.8±5.6) [(p = ns) (not significant)], short TR/TE (200-400/15-20) fatsat images (-6.2±4.8) (p=0.05), and short TR/TE regular SE images (-4.9±3.2) (p<0.01). Lesion detection was greatest for long TR/TE fatsat (86) followed by long TR/TE regular SE (78) (p=0.05), short TR/TE fatsat (65) (p<0.01), and short TR/TE regular SE (60) (p<0.01). The results of this study suggest that excitation-spoiling fat suppression may improve liver lesion detection and conspicuity.     

Value of the dynamic and delayed MR sequence with Gd-DTPA in the T-staging of stomach cancer: correlation with the histopathology

Background: To evaluate the usefulness of dynamic and delayed magnetic resonance (MR) imaging in the T-staging of stomach cancer and to compare the enhancement pattern of the cancerous lesion and the normal wall. Methods: We performed MR imaging in 46 patients with stomach cancer (including four early gastric cancers and 42 advanced gastric cancers). Axial, sagittal, or coronal two-dimensional fast low-angle shot) MR images for the water-distended stomach were obtained with dynamic protocol, including precontrast images and images obtained 30, 60, 90, and 240–300 s after intravenous injection of the 0.1 mM Gd-DTPA/kg solution. We evaluated the thickness, interruption (or not) of the low signal intensity bands, and enhancement pattern of the cancerous wall and normal gastric wall. We prospectively evaluated the depth of cancer invasion, perigastric infiltration (extraserosal invasion), perigastric organ invasion, and regional lymph nodes and determined tumor staging on MR images. These MR evaluations including MR-determined staging were correlated with the surgicopathologic findings. Results: Stomach cancer was shown as having a thickened wall with a rapid enhancing pattern after intravenous Gd-DTPA administration. The mucosa (and/or submucosa) affected by stomach cancer showed an early enhancement pattern (30–90 s after Gd-DTPA administration) in 43 of 46 patients (93%). The normal gastric mucosa demonstrated a delayed peak enhancement pattern (>90 s after Gd-DTPA administration) in 29 of 46 patients (63%) and variable enhancement pattern in 17 of 46 patients (37%). An interrupted low signal intensity band or highly enhanced tumorous lesion penetrating through the gastric wall was seen in 17 of 19 pT3 patients (90%). Consistency between MR-determined staging and surgicopathologic staging occurred in three of four pT1 tumors (75%), 10 of 13 pT2 tumors (77%), 17 of 19 pT3 tumors (90%), and eight of 10 pT4 tumors (80%); overall accuracy was 83%. Overall accuracy of regional lymph node involvement, as determined by enhanced MR, was 52%; 24 of 46 node groups were positive. Conclusions: Dynamic and delayed MR imaging can be useful for predicting depth of cancer invasion, perigastric infiltration (extraserosal invasion), and perigastric organ invasion by gastric cancer. Received: 28 July 1998/Revision accepted: 27 January 1999     

Contrast enhancement of the gastrointestinal tract on MR images using intravenous gadolinium-DTPA

Gadopentetate dimeglumine was administered intravenously to 16 patients undergoing abdominal magnetic resonance (MR) imaging. T1-weighted and fat-suppressed T1-weighted images were acquired before and after intravenous administration of 0.1 mmol/kg gadopentetate dimeglumine. The stomach, small bowel, and colon were analyzed regarding the presence and relative intensity of contrast enhancement. Diffuse enhancement of the gastrointestinal tract wall was observed in all patients following contrast material administration. Such enhancement was most conspicuous on fat-suppressed T1-weighted images. Quantitative measurements indicated that the wall of the gastrointestinal tract enhanced approximately 100% with gadopentetate dimeglumine. This study demonstrates that enhancement of the normal gastrointestinal tract occurs routinely when intravenous gadopentetate dimeglumine is administered, and such enhancement should not be considered indicative of gastrointestinal pathology. Furthermore, it suggests the potential utility for using intravenous rather than orally administered contrast agents to provide enhancement of the gastrointestinal tract on MR images.     

MR imaging of intrahepatic cholangiocarcinoma

Background: The purpose of this study was to determine the magnetic resonance (MR) features of intrahepatic cholangiocarcinoma. Methods: MR imaging studies of seven cases of pathologically proven intrahepatic cholangiocarcinoma were retrospectively reviewed. Results: On MR images the tumors presented as a single mass (N = 5) or multiple nodules (N = 2), as welldelineated (N = 5) or ill-defined (N = 2), and as non-encapsulated (N = 7). Mean tumor diameter ranged from 6–14 cm (mean, 10 cm). On T1-weighted (TR/TE = 400–600/10–17 msec) images, the tumors were hypointense compared to the liver. The five tumors studied with dynamic MR imaging showed progressive centripetal filling-in after intravenous administration of a gadolinium chelate. On T2-weighted (TR/TE = 2000–2500/80–100 msec) images, all tumors were hyperintense compared to the liver; five were markedly hyperintense and two moderately hyperintense. Vascular encasement, bile duct dilatation within the tumor, and central scar were depicted on MR images in four, three, and two tumors respectively. Conclusion: The typical MR appearance of intrahepatic cholangiocarcinoma is a large well-delineated nonencapsulated tumor associated with intrahepatic venous encasement.     

Comparison of computed tomography and magnetic resonance imaging in the evaluation of focal hepatic lesions

Two combined magnetic resonance (MR) spin-echo pulse sequences at 0.35 T were compared with dynamic bolus contrast-enhanced computed tomography (CT) in the evaluation of focal hepatic lesions. Each combined MR sequence was performed in a separate group of patients. The first group consisted of 76 patients in whom a moderately T1-weighted sequence (spin echo [SE] 500/30 [repetition time/echo time]) was combined with a T2-weighted sequence (SE 2000/60). In the second group, consisting of 68 patients, a more heavily T1-weighted sequence (SE 250/15) was combined with the T2-weighted sequence. All studies were evaluated in a retrospective blinded fashion, with construction of receiver operating characteristic curves.We conclude that, in detection of patients with one or more focal hepatic lesions, either combined MR sequence was comparable to CT. In the detection of individual hepatic lesions, the sensitivity of the combined MR sequence with a moderately T1-weighted sequence (SE 500/30 and 2000/60) was essentially equivalent to CT (79 vs 77%, respectively). Additionally, a combined MR sequence with a heavily T1-weighted pulse sequence (SE 250/15 and 2000/60) was not statistically different than CT (86 vs 80%, respectively). These findings were supported by the receiver operating characteristic analysis.     

低场强MR动态增强扫描对肝脏肿瘤的诊断与鉴别诊断

目的:运用Gd-DTPA增强研究肝肿瘤低场强MR动态扫描及其价值。材料与方法:32例肝肿瘤39个病灶SE序列(TR/TE200～250/30ms)于1′、2′、5′、10′、20′分别作增强扫描,Gd-DTPA剂量0.1mmol/kg。结果:病例经手术病理和/或临床综合检查随访证实,包括原发性肝癌(HCC)22个病灶,血管瘤8个、囊肿5个,转移癌3个,局灶结节增生(FNH)1个。增强表现分为均匀增强(HCC 16/22、血管瘤2/8 FNH 1/1),延迟增强(血管瘤6/8,FNH1/1),不均匀增强(HCC 6/22、转移癌3/3)不增强(囊肿5/5)。结论:低场强MR短TR/TE SE序列可获得满意诊断图像;Gd-DTPA动态增强扫描对肝脏肿瘤诊断与鉴别诊断有重要价值。但目前此技术尚不能完全替代CT动态扫描。     

MRI in Migraineurs

Forty-six migraineurs and 69 age- and sex-matched controls referred for MRI scans of the brain were evaluated for the incidence of intracranial pathology. Axial long TR/short TE and long TR/long TE and sagittal short TR/short TE scans were performed in all patients. Enhancement with Gd-DTPA was performed in all controls and in nine migraineurs. Six of 46 (13%) of the migraineurs had white matter lesions versus three of 69 (4.3%) of the controls. The white matter lesions in migraineurs were seen in a younger age group than in the controls. These findings agree with recent MRI studies. Ischemia or an immune-based white matter demyelination are possible mechanisms for the white matter lesions.     

磁共振延迟成像时间对急性心肌梗死测定的影响

目的 本研究探讨不同磁共振延迟成像(comrast-enhanced magnetic resonance imaging,CeM-砌)时间是否影响急性心肌梗死(acute myocardial infarctin,AMI)后梗死面积的测定.并探讨磁共振测定的射血分数与左窒造影测定的射血分数的相关性.方法 选择在2005年6月至2006年4月在复旦大学附属中山医院住院治疗的患者,27例首次确诊为急性心肌梗死的患者进行前瞻性研究,年龄(54.3±10.5)岁.所有患者均动态观察心肌酶谱的变化,并经冠脉造影明确,冠脉造影同时测定左室造影射血分数,磁共振(SIMENS 1.5T)检查时间为心肌梗死后(13.2±5.2)d,磁共振检查方法 是首先进行电影扫描,测定射血分数,然后经静脉以5 mL/秒注入0.05 mmol/kgGd-DTPA行首过成像,最后经高压注射器静脉以2 mL/s注入0.15 mmol/kg Gd-ffFPA行延迟成像,测定心肌梗死面积,在延迟注药后5 min开始延迟期采集.选择存在延迟增强高信号区的同一短轴层面,每间隔5 min成像一次测定梗夕匕面积,直至20 min.采用配对t检验进行统计,并进行相关分析.结果 27例患者在延迟CeMRI上均存在延迟增强区,27例患者测定的梗死面积为(17.9±9.8)%,测定CK峰值为(2003.5±1496.8)U/L,肌钙蛋白T峰值为(4.6±3.3)ng/mL.梗死面积与CK峰值的相关系数为r=0.819(P<0.01),梗夕匕面积与肌钙蛋白T相关系数为r=0.517(P<0.05).存在梗死心肌的同一层面测定的梗死而积百分比在5 min,10 min,15 min及20 min时分别为(7.2±6.2)%,(8.5±7.4)%,(7.3±6.3)%及(6.9±6.4)%(10 min与20 min相比,P<0.05).MR测定的左室射血分数与造影测定的射血分数相关系数为r=0.867(P<0.01).结论 CeMRI可以诊断心肌梗死和定量测定梗死范围.磁共振测定与左室造影测定的射血分数密切相关.测定梗死范围时,不同延迟成像的时间影响梗死范围的测定.     

静脉注射钆喷酸葡胺增强改善MRCP图像质量研究

目的：评价静脉注射钆喷酸葡胺（Gd-DTPA）增强在改善磁共振胰胆管成像（MRCP）图像质量的作用。方法：选择临床疑有胰胆管病变并准备行MRI检查患者31例作为研究对象，所有患者分别行Gd-DTPA增强前及增强后1．5min、5-10min、10．15min MRCP扫描。测量并比较增强前后MRCP图像上肝脏、胰腺、胆总管、胰管的信噪比（SNR）以及胆总管与肝实质、胰管与胰腺的信号强度比（SIR）。结果：静脉注射Gd-DTPA增强后1-5min、5．10min及10．15min图像上胰胆管树各解割结构显示情况和平均等级分数均无统计学差异（P〉0．05）；Gd-DTPA增强后的MRCP图像胰胆管树解剖结构显示情况和平均等级分数与增强前比较差异有显著性（P〈0．001）。Gd-DTPA增强后MRCP图像上来自肠系膜上静脉及其分支与胰管重叠的血管信号、左右门静脉及其分支与肝内二级胆管重叠的血管信号被明显抑制。肝脏及胰腺信号强度降低，胰胆管树对比度提高，肝内2级胆管、肝总管、胆总管和胰管显示更加清楚。结论：MRCP成像中，静脉注射Gd-DTPA增强能抑制来自左右门静脉和肠系膜上静脉及其分支等血管的高信号，提高胰胆管树的对比度，明显改善MRCP图像质量。[著者文摘]     

颅脑肿瘤磁共振扫描增强的价值(附72例分析)

目的：颅脑肿瘤注入Ｇｄ－ＤＴＰＡ（磁显葡胺）以区别瘤体与水肿，鉴别肿瘤良、恶性及囊壁，显示脑转移瘤和子瘤灶，达到临床诊断目的；资料和方法：７２例颅脑肿瘤，其中脑内肿瘤４８例，脑外肿瘤２４例。均用ＡＳＭ－０１５Ｐ永磁型ＭＲＩ扫描机，采用头线圈，ＳＥ序列：Ｔ１加权像ＴＲ＝５００ｍｓ，ＴＥ＝３０ｍｓ，Ｔ２加权像ＴＲ＝２０００－３０００ｍｓ，ＴＥ＝１００－１２０ｍｓ，，层厚５－１０ｍｍ，方位行横、冠、矢状位，增强扫描为：静脉缓慢注入Ｇｄ－ＤＴＰＡ（磁显葡胺）按０１－０２ｍｌ／ｋｇ体重，注药后５、１０、２５、３５ｍｉｎ作相应方位Ｔ１加权像扫描；结果：１脑内肿瘤４８例，胶质瘤３３例，明显及部分强化２５例，不强化８例，脑转移１５例均强化共３９个瘤灶（其中新发现８个）；（２）脑外肿瘤２４例，脑膜瘤１４例，垂体瘤６例，听神经瘤３例上述均强化，硬膜外表皮样囊肿１例不强化；结论：颅脑肿瘤通过静脉注入Ｇｄ－ＤＴＰＡ（磁显葡胺）可以明确瘤灶与水肿及发现Ｔ２加权像上被水肿掩盖的子灶，达到临床诊断目的。     

Magnetic resonance tomography as a localization method in hyperparathyroidism

Magnetic Resonance Imaging (MRT) was performed in 36 consecutive patients with hyperparathyroidism. MR tomograms of 31 patients were evaluated and compared with the results of operation and histology (n = 29). In the remaining 5 patients MR examination was not completed, due to claustrophobia or motion artefacts. MR examinations were performed in 2 superconductive magnets (0.5 and 1.5 Tesla). A surface coil with following spinecho sequences was used: SE: TR/TE: 550-700/15-30; 2000/22-100. All patients were subjected to additional sonography. Out of 28 parathyroid adenomas 25 were identified on MR tomograms (sensitivity: 73%, specificity: 90%). However, only 2 out of 6 hyperplastic parathyroid glands were localized on MR tomograms. Lesions missed on MR tomograms measured 15 mm and less in diameter. It is characteristic that parathyroid adenomas showed isointense MR signal to the thyroid (SE 550/30 and hyperintense MR signal to fat (SE 2000/100). Different signal intensities of the adenomas were observed in 25% of the cases. MR imaging is a valuable diagnostic method for preoperative localisation of parathyroid adenomas. We think that MR imaging should be performed when sonography and subtraction scintigraphy are not able to identify a suspected adenoma in the same location.     

宫颈癌的MRI分析

目的 探讨宫颈癌的MRI表现，评价MRI成像方法。方法 98例经病理证实的宫颈癌患者(鳞癌89例，腺癌7例，腺鳞癌2例)行盆腔部轴位SE T1WI，轴位及矢状位TSE T2WI，冠状位脂肪抑制(SPIR)TSE T2WI及Gd—DTPA增强后轴位、冠状位、矢状位SE T1WI扫描。分析肿瘤的MRI表现特征及侵犯范围，部分病例MRI所见与手术所见和病理结果对比。结果 宫颈癌的MRI表现颇具特征性，T2WI呈较高信号，与宫颈基质低信号及子宫内膜、宫旁脂肪组织高信号有良好对比，T1WI呈等或低信号，Gd—DTPA增强后T1WI可轻度强化。33例出现信号不均匀表现，病理上可为假腺腔、坏死及角化珠。在MRI上，83．6％的宫颈癌出现宫颈外侵犯，其中阴道侵犯68．4％，宫体侵犯53．1％。结论 MRI能多方位清晰显示宫颈癌瘤灶及侵犯范围与途径，明显优于其他影像学检查方法，可作为宫颈癌治疗前常规的影像检查方法。     

Leiomyoma of the adrenal gland in a patient with AIDS

Leiomyoma of the adrenal gland is an exceptional localization. We report a case occurring in a young patient with AIDS. Diagnosis was a surprise on pathologic examination. On enhanced computed tomographic (CT) scan, the adrenal mass had a low central attenuation area and a thin enhancing peripheral ring. On magnetic resonance (MR) imaging the left adrenal mass was isointense with the liver on T1-(TR/TE = 500/ 300 ms) and T2-(TR/TE = 2030/60, 120 ms) weighted spin-echo images, except a central area with a lower signal on T1-weighted images and a higher signal on T2-weighted images. The mass was slightly enhanced after Gd-DOTA injection, but the central area remained unchanged.     

大脑灰质异位症的MRI诊断：附2例家族性病例报告

通过2例家族性大脑灰质异位症致癫痛大发作病例的MRI检查。对大脑灰质异位症的MRI特征，MRI检查方法进行了分析讨论，自旋回波序列能清楚显示大脑白质内及室内膜处的异位灰质；异位灰质在所有加权扫描中，信号强度与正常灰质均一致为其MRI特征；质子加权扫描（TR／TE＝3937／19MS）较其它加权扫描效果为佳，文章认为在癫痫大发作病人中签别其病因十分重要、MRI是目前诊断大脑灰质异位征的最有效方法。     

Imaging diagnosis of hepatic metastases of pancreatic carcinomas: significance of transient wedge-shaped contrast enhancement mimicking arterioportal shunt

We aimed to evaluate the imaging findings of hepatic metastases from pancreatic cancers, especially wedge-shaped enhancement and its etiology. Dynamic CT and MR images were performed in 87 patients with liver metastases from pancreatic carcinomas, and CT during arterial portography (CTAP) and CT during hepatic arteriography (CTHA) in 51 patients. Liver metastases were multiple in 84 patients (97%) and solitary in only three (3%). In 44 of 87 patients (51%), all liver metastases showed ring-like enhancement compatible with metastatic adenocarcinomas on dynamic CT and/or dynamic MR imaging. In 37 patients, more than one metastatic lesion showed wedge-shaped contrast enhancement on dynamic CT, dynamic MRI and CTHA, and wedge-shaped perfusion defect on CTAP adjacent to metastatic tumors. Six patients showed multiple wedge-shaped enhancements, which were initially diagnosed as multiple arterioportal shunts (AP shunts). However, metastatic tumors appeared within the area of wedge-shaped enhancement and increased in size on follow-up CT and/or MR images. After all, 43 of 87 patients (49%) had AP shunt like contrast enhancement adjacent to liver metastases. Liver metastases from pancreatic carcinomas frequently show transient wedge-shaped enhancement, and should not be misdiagnosed as nontumorous arterioportal shunts.     

胰岛细胞瘤的MRI表现与鉴别诊断

目的探讨MRI在胰岛细胞瘤诊断和鉴别诊断中的价值。方法回顾性分析病理证实的9例胰岛细胞瘤的MRI表现特点。MRI检查包括SET1WI、抑脂FSET2WI和FSPGR动态增强扫描。结果9例在MRI共发现10个病灶,1例无功能胰岛细胞瘤有2个病灶。抑脂T2WI高信号(7/10),抑脂FSPGRT1WI低信号(7/10)。三期明显强化(4/10);动脉期强化不明显,静脉和平衡期强化逐渐明显(4/10);环形强化(2/10)。结论MR检查在胰岛细胞瘤诊断和鉴别诊断中有重要价值。