门腔间隙的CT和MRI研究--正常表现及临床意义

目的:研究门腔间隙(PCS)的CT、MRI表现和解剖基础,获得门腔淋巴结(PCN)的正常值并探讨相关临床意义。方法:选取60例和40例分别行CT及MRI增强扫描患者的影像资料。所有患者均无腹部疾病的病史及相关症状和体征,影像学检查显示腹部无恶性肿瘤、炎症及外伤性病变。观察门腔间隙的CT、MRI表现,测量门腔淋巴结前后径。结果:本组100例中共有43例(43.0%)在CT或MRI上显示PCN,其最大前后径为(0.64±0.31)cm,95%可信区间为0.54~0.74 cm;64例(64.0%)PCS内显示肝尾状叶,其中10例(10.0%)显示乳头突,4例(4.0%)显示尾状突;26例(26.0%)显示门腔血管;5例(5.0%)显示胆囊管。PCS上段的主要解剖结构为肝尾状叶,而PCN、门腔血管多位于PCS下段。结论:PCS内以肝尾状叶和PCN最为常见,PCN的出现率为43.0%;PCN前后径的上限为1.0 cm,此值可作为判断PCN增大的基础和依据。     

肝门部肿瘤32例影像学分析及术前评估

目的:探讨超声、螺旋CT、MRI对肝门部肿瘤的诊断价值及MRI对病变术前评估的意义.方法:回顾性分析32例肝门部肿瘤(其中肝细胞癌(HCC)6例,胆管癌(nc)16例,转移性病变8例,血管瘤2例),均具超声、MRI影像资料,16例具有螺旋CT资料,并与手术.病理结果比较.结果:(1)超声、螺旋CT、MRI对肝门部肿瘤的检出率分别为63.3%;81.3%;100%;(2)Mm对其定性准确率为75%;MRI三种组合扫描方式:((1)平扫 MRCP;((2)"(1)" 动态增强扫描;(3)"(2)" 三维动态增强磁共振血管成像(3D DCE-MRA))其对病变能否切除评估准确率分别为43.8%;59.4%;78.1%.结论:超声对肝门部肿瘤的准确诊断显示欠满意,但对其伴随征象具有一定价值;CT、MRI是病变有效的诊断方法,MRI在显示肿块范围、胆管及门静脉受侵、淋巴结肿大方面优于CT;MRI多种扫描方式相结合对病变术前评估具有重要意义.     

艾滋病合并腹部结核的CT表现

目的 研究艾滋病(AIDS)合并腹部结核的CT表现.方法 回顾性分析33例经病理、病原学证实及临床诊断艾滋病合并腹部结核的腹部CT扫描表现.结果 33例AIDS合并腹部结核患者腹部CT示腹部淋巴结肿大23例(69.7%,23/33);肝脾肿大10例(30.3%,10/33);脾内多发低密度结节14例(42.4%,14/33),其中脾内弥漫粟粒状低密度结节9例(27.3%,9/33);肝内低密度结节7例(21. 2%,7/33),其中肝脓肿1例(3.0%,1/33);腹膜及大网膜增厚5例(15.2%,5/33),其中伴腹腔积液2例(6.1%,2/33);回盲部肠壁不规则增厚4例(12.1%,4/33);腰椎骨质破坏伴椎旁脓肿及左腰大肌脓肿1例(3.0%,1/33),腰大肌脓肿1例(3.0%,1/33).结论 AIDS合并腹部结核常表现肝脾结核、腹部淋巴结结核、肠结核及腹膜结核等,CT对病灶的检出有重要意义.     

正常颅颈交界区韧带结构的影像研究

目的 探讨颅颈交界区(CCJ)韧带结构的影像特点,优化该区域韧带的检查方法 及序列.方法 各选取51名健康志愿者,分别行CT和MR检查.分析CCJ韧带结构的CT和MRI表现,并由2名高年资影像医师比较T1WI、T2WI、质子密度加权像(PDWI)、T2*WI、短时反转恢复序列(STIR)及质子密度加权脂肪饱和序列(PDFSAT)对CCJ韧带的显示效果.对原始数据进行标准正态秩变换,然后进行重复测量方差分析.结果 CT和MRI均能清晰显示除寰枕前膜(仅在MRI上显示)以外的CCJ韧带结构及其毗邻结构,其中MRI更具优势.寰枕前膜在MRI上显示率为100%(51/51),齿突尖韧带在CT和MRI上显示率分别为29.4%(15/51)、43.1%(22/51),寰枕后膜-硬膜复合体、覆膜-硬膜复合体、横韧带及翼状韧带在CT和MRI上的显示率均为100%(51/51).2名医师对于PDWI的评分结果 M均为5.0分,差异无统计学意义(F=0.000 P>0.05);PDWI明显高于T1WI(M=3.0分)、T2WI(M=3.0分)、T2*WI(M=1.0分)、STIR(M=1.0分)及PDFSAT(M=3.0分),P值均<0.01.结论 MRI在显示CCJ韧带结构方面优于CT,PDWI为CCJ韧带的最佳MR成像序列.通过对正常CCJ韧带的影像学研究,能够为该区各韧带病变的诊断和治疗提供客观依据.     

20例小脑转移瘤的MRI分析

目的 探讨小脑转移瘤的MRI表现.资料与方法 回顾性分析20例小脑转移瘤,其原发灶均经纤维支气管镜活检或手术活检病理证实,对其MRI表现特征进行总结分析.结果 20例患者中仅累及小脑者8例(40%),合并大脑或脑干转移者12例(60%);共计发现42个病灶,其中位于左侧小脑半球14个,右侧小脑半球17个,小脑蚓部11个.病变周围伴轻度水肿15个(35.7%);中度水肿5个(11.9%);重度水肿13个(31.0%);无水肿9个(21.4%).增强扫描后,病灶呈实性结节或球形强化者23个;环状强化者12个;线团状强化者5个;片状强化者2个. 结论小脑转移瘤的MRI表现具有一定特征性,MRI对小脑转移瘤的诊断及鉴别诊断具有重要价值.     

肝内胆管囊腺瘤的影像学诊断和鉴别诊断

目的 分析肝内胆管囊腺瘤的CT、MRI表现提高对该病的诊断与鉴别诊断水平.方法 回顾性分析6例经手术病理证实的肝内胆管囊腺瘤的CT、MRI资料.结果 6例均为单发,均累及肝左叶,除1例为单房,其余5例均为多房囊性病灶.5例可见囊内结节,增强后均不同程度强化.CT平扫示1例分隔细线样钙化.3例MRI表现为长T1长T2信号,1例为稍短T1长T2信号.1例MRCP示肝内胆管扩张并与病灶相连.结论 CT、MRI能清晰显示肝内胆管囊腺瘤的特征性表现(多房、囊内分隔、结节、钙化等),可为本病诊断与鉴别诊断提供依据.     

阔韧带平滑肌瘤CT和MRI征象及误诊因素分析

目的 探讨阔韧带平滑肌瘤CT和MRI征象并行误诊因素分析,提高对该疾病的认识和诊断水平.方法 回顾性分析经手术后病理证实阔韧带平滑肌瘤24例,术前均行下腹盆腔CT和/或MRI平扫及增强扫描,分析阔韧带平滑肌瘤的CT和MRI征象及误诊率并行误诊相关因素分析.结果 24例患者CT及MRI均表现为盆腔内子宫外巨大肿块,肿瘤平均大小约(15±8.1) cm.18例患者CT表现肿瘤边界清楚17例,边界不清1例;平扫肿瘤密度均匀15例,混合性密度 3例;增强扫描肿瘤均见明显强化伴局灶性低密度区.另6例 MRI检查患者均显示肿瘤与邻近器官及子宫体分界清晰,能较好显示肿块完整包膜,T1WI为等或略低信号,T2WI为中等信号,部分肿瘤内间杂斑点、条状高信号灶,注射钆喷替酸葡甲胺(GdDTPA)后肿瘤明显强化伴斑点状无强化区.本组病例CT和MRI总误诊率37.5%(9/24),其中CT误诊率44%(8/18),MRI误诊率16.7%(1/6);被误诊为卵巢恶性肿瘤6例(67%,6/9),卵巢畸胎瘤1例(11%,1/9),子宫浆膜下肌瘤1例(11%,1/9),盆腔肿块来源待定1例(11%,1/9).结论 阔韧带平滑肌瘤缺乏特异临床表现,术前诊断常较困难,CT和MRI均是术前诊断阔韧带平滑肌瘤较好影像学方法,但存在一定误诊率,影像科医生需提高对该疾病影像表现及误诊因素认识.     

多层螺旋CT对肝硬化门腔间隙及C/RL-r的临床价值分析

目的探讨多层螺旋动态增强CT对门腔间隙(PCS)及改良肝尾-右叶比值(C/RL-r)的影像学表现临床价值。方法对453例采用多层螺旋动态增强CT进行检查的肝硬化患者作为本次的观察研究对象,测量出各个患者的门腔间隙(PCS),并对其进行分析与改良肝尾-右叶比值(C/RL-r)的相关情况,探究门腔间隙增宽诊断肝硬化的意义。结果C/RL-r≥0.9的患者PCS上段宽度、PCS下段宽度、长度与门腔淋巴结PCN短径C/RL-r0.9的患者均具有明显的差异(P0.05),并且C/RL-r≥0.9的患者PCS下段肝组织出现情况与PCN出现情况与C/RL-r0.9的患者也具有明显差异(P0.05),患者门腔间隙内结构的分布中,C/RL-r≥0.9的患者PCN上段出现的患者为128例,C/RL-r0.9的患者PCN上段出现的患者为299例,为两组最多,PCS上段对于肝硬化患者诊断的特异性为87.1%,敏感性为68.3%,准确度为77.2%,而PCS下段对于肝硬化患者诊断的特异性为76.9%,敏感性为73.4%,准确度为75.6%。结论改良肝尾-右叶比值大于0.9的患者门腔间隙宽度与其比值呈正相关性,患者肝萎缩牵引会导致门腔间隙淋巴结增宽,对患者肝硬化的诊断具有一定的意义。     

淋巴瘤累及腹膜、网膜和肠系膜的CT表现

目的 分析淋巴瘤累及腹膜和/或网膜及肠系膜的CT表现.方法 回顾分析11例经临床确诊且均行腹部CT检查的非霍奇金淋巴瘤患者的CT图像.CT征象包括:腹膜线样或结节样增厚、腹水、网膜肿块、淋巴结肿大、实质性脏器累及、肠道病变等.结果 淋巴瘤累及腹膜、网膜和肠系膜均为非霍奇金淋巴瘤(NHL),以弥漫大B细胞型(n=8)多见.CT表现为腹膜线样或结节样增厚10例;网膜结节或肿块6例;系膜结节、肿块或条形密度影10例;腹水9例;肠道病变5例;腹膜后淋巴结肿大9例;肝肿大2例,脾肿大2例,肝、脾同时肿大2例,肾脏浸润1例.结论 淋巴瘤累及腹膜、网膜和肠系膜CT表现缺乏特征性,遇有腹膜和/或系膜和网膜病变时应想到本病的可能.     

周围型小细胞肺癌和非小细胞肺癌CT表现对比分析

目的 探讨周围型小细胞肺癌CT表现特征.方法 应用配比病例对照研究的方法 ,回顾性分析经病理证实的、原发灶≤3 cm的周围型小细胞肺癌和非小细胞肺癌各30例的临床资料和CT表现.结果 30例周围型小细胞肺癌CT表现为分叶征(23/30)、边缘光滑锐利(22/30)、毛刺或棘突征(8/30)、胸膜凹陷征(7/30)、血管连接征(2/30)等.30例周围型非小细胞肺癌CT表现为分叶征(16/30)、边缘光滑锐利(6/30)、毛刺或棘突征(24/30)、胸膜凹陷征(24/30)、血管连接征(8/30)、空泡或空洞或支气管征(13/30)等.经卡方检验发现小细胞肺癌和非小细胞肺癌中的分叶征发生频率差异无统计学意义(χ2=3.5897,P=0.0581),其它征象的差异有统计学意义.30例周围型小细胞肺癌发现肺门和纵隔淋巴结肿大22例(73.3%),30例周围型非小细胞肺癌发现肺门和纵隔淋巴结肿大5例(16.7%),经统计学分析差异有统计学意义(χ2=19.4613,P<0.001).结论 原发灶≤3 cm的周围型小细胞肺癌主要CT表现为边缘光滑锐利的密实结节.原发灶较小时即可伴有明显的肺门、纵隔淋巴结肿大(转移).     

上腹部病变门腔静脉间隙结构变化的CT观察

目的 探讨上腹部病变对门腔静脉间隙的影响.资料与方法 回顾性分析68例经临床或病理证实的上腹部病变患者的CT影像资料,重点观察门腔静脉间隙的CT变化.结果 59例有门腔静脉间隙改变的患者中,门腔静脉间隙淋巴结改变42例(71.2%),肝尾状叶增大8例(13.6%),血管迂曲增多8例(13.6%),胆管增粗2例(3.4%),腹水4例(6.8%),病变直接累及门腔静脉间隙6例(10%).结论 上腹部良恶性疾病在一定时期会引起门腔静脉间隙发生改变,包括淋巴结改变、尾状叶增大、血管增多迂曲、胆管增粗和腹水.     

原发性肝细胞癌上腹部转移的CT诊断

笔者报道57例经病理组织学证实,并作手术探查有上腹部转移的原发性肝细胞癌(HCC)CT表现,着重分析上腹部淋巴结转移,肝胃、肝十二指肠和镰状韧带转移的CT 改变。同时对门静脉、下腔静脉以及肝内转移作了描述。本文认为,CT 对HCC 上腹部转移的诊断和鉴别诊断有特殊意义。     

Unsuspected mesenteric arterial abnormality: comparison of MDCT axial sections to interactive 3D rendering

OBJECTIVE: The purpose of our study was to determine how frequently significant mesenteric arterial abnormalities that were identified by interactive 3D CT with volume rendering and maximum intensity projection were detected by axial images alone in a series of patients for whom there was no clinical suspicion of mesenteric vascular disease. Axial CT and 3D interpretations were compared for lesions involving the celiac and superior mesenteric arteries or their branches. On a per-patient basis, the axial and 3D interpretations were equivalent in 24% (10/41) of the cases. Axial CT partially agreed with 3D CT in 10% (4/41), and no mesenteric arterial lesion was reported on axial CT in 66% (27/41). The 3D CT findings were supported by other imaging, surgery, clinical findings, or management in 49% (20/41) of the cases. The mesenteric lesions identified resulted in a change in patient management in 15% (6/41) of the subjects. CONCLUSION: Unsuspected mesenteric arterial abnormality may elude diagnosis when axial MDCT sections are interpreted without 3D renderings.     

MRI of small hepatocellular carcinoma: comparison with US, CT, DSA, and Lipiodol-CT.

Thirteen cirrhotic patients with 27 nodules of hepatocellular carcinoma less than 3 cm (small HCC) were examined with ultrasonography (US), MR, pre- and postcontrast CT, digital subtraction angiography (DSA), and CT after injection of Lipiodol (Lipiodol-CT). The accuracy of MR was compared with other diagnostic modalities and MR morphologic and the signal intensity features of HCC were investigated. The detection rate by MR was 63%, by US 67%, by CT 50%, by DSA 74%, and by Lipiodol-CT 93%. The Mc Nemar test showed no difference between the detection rates of MR and CT, MR and DSA, MR and US, and Lipiodol-CT and DSA; however, the differences between the detection rates of MR and Lipiodol-CT and CT and Lipiodol-CT were statistically significant (p less than or equal to 0.05). The difference in sensitivity between the detection rates of Lipiodol-CT and US was just above the level considered significant (P less than or equal to 0.065). On T1- and T2-weighted spin echo images 83% of small HCC were hyperintense relative to the surrounding liver parenchyma. Pseudocapsule was observed in 58% of lesions on T1-weighted images in particular. We believe that US is still the best diagnostic technique for the screening of HCC. We prefer MR to CT as a second level examination to support US in noninvasive diagnosis of small HCC, since MR gives the same or slightly better results than CT without the need of ionizing radiation and large amounts of iodized contrast medium. In our opinion, more invasive examinations, such as DSA and Lipiodol-CT, cannot be avoided in cases where an exact knowledge of the number of lesions is essential for the choice of therapy.     

Fibrolamellar hepatocellular carcinoma: imaging and pathologic findings in 31 recent cases.

PURPOSE: To review characteristic findings of fibrolamellar hepatocellular carcinoma (HCC) at computed tomography (CT) and magnetic resonance (MR) imaging. MATERIALS AND METHODS: The authors retrospectively reviewed the clinical, pathologic, and preoperative imaging findings in 31 patients with histologically proved fibrolamellar HCC. Dynamic contrast material-enhanced CT of the liver was performed in 31 patients, helical multiphase CT in 21, and MR imaging in 11. Complete resection was performed in 17 patients, and imaging-pathologic correlation was performed. RESULTS: Large tumors (mean diameter, 13 cm) were depicted at CT and MR in all cases. At CT, the margins of the tumors were well defined in 24 (77%) of 31 cases calcifications were depicted in 21 (68%), a central scar in 22 (71%), and abdominal lymphadenopathy in 20 (65%). In 20 (80%) of 25 cases with hepatic arterial phase CT images, all tumors were heterogeneous and depicted areas of hypervascularity. At MR imaging, tumors were hypointense to liver on T1-weighted images (n = 11) and hyperintense to liver on T2-weighted images (n = 10). Calcification was not depicted on MR images, but a central scar was depicted as hypointense to surrounding tumor in nine cases. CONCLUSION: CT and MR images demonstrate characteristic features that may allow confident diagnosis of fibrolamellar HCC.     

Enhancement of focal liver lesions at gadoxetic acid-enhanced MR imaging: correlation with histopathologic findings and spiral CT--initial observations

PURPOSE: To detect hepatocyte-selective enhancement of focal lesions with gadoxetic acid at magnetic resonance (MR) imaging and to correlate enhancement in hepatocyte-selective phases with histopathologic findings and in arterial and portal venous phases with biphasic computed tomographic (CT) findings. MATERIALS AND METHODS: Study was supported by local ethics committee; all patients gave written informed consent. In 19 men and 14 women recruited in three clinical studies, histopathologic correlation and CT scans of 41 focal lesions (13 primary malignant lesions, 21 metastases, three adenomas, three cases of focal nodular hyperplasia [FNH], and one cystadenoma) and ultrasonographic confirmation of five cysts were available. MR was performed before and during arterial and portal venous phases and in hepatocyte-selective phases 10 and 20 minutes after injection of gadoxetic acid. Enhancement was evaluated in consensus by two observers. Enhancement pattern and morphologic features during arterial and portal venous phases were correlated between gadoxetic acid-enhanced MR and CT images by means of adjusted chi(2) test. RESULTS: Hepatocyte-selective uptake was observed 10 and 20 minutes after injection in FNH (three of three), adenoma (two of three), cystadenoma (one of one), and highly differentiated hepatocellular carcinoma (HCC [grade G1], two of four). Uptake was not detected in metastases (21 of 21), cholangiocarcinoma (three of three), combined hepatocellular cholangiocarcinoma (one of one), undifferentiated carcinoma (one of one), moderately or poorly differentiated HCC (grade G2-G3) (four of four), HCC (grade G1, two of four), adenoma with atypia (one of three), or cysts (five of five). During arterial and portal venous phases, there was high overall agreement rate of 0.963 between gadoxetic acid-enhanced MR and CT (simultaneous 95% confidence interval: 0.945, 0.981). CONCLUSION: Liver-specific enhancement of focal lesions is hepatocyte selective and correlates with various histopathologic diagnoses regarding presence of certain hepatocytic functions. Arterial and portal venous MR images obtained with gadoxetic acid are comparable to those of CT.     

Evaluation of cystic renal masses: comparison of CT and MR imaging by using the Bosniak classification system

PURPOSE: To compare computed tomography (CT) and magnetic resonance (MR) imaging in the evaluation of cystic renal masses by using the Bosniak classification system. MATERIALS AND METHODS: Images of 69 renal masses in 59 patients (38 men, 21 women; mean age, 60.4 years; range, 30-86 years), who had undergone both CT and MR imaging examinations within 1 year (average, 60.5 days; range, 0-356 days), were retrospectively analyzed by two radiologists in consensus. For each lesion, images were compared for thickness of wall and septa, number of septa, and presence of enhancement. Each mass was categorized (Bosniak classification) first on CT images and then on MR images, and results were compared. Pathologic correlation was available in 25 lesions. RESULTS: On CT images, there were 15 category I, 16 category II, 10 category IIF, 19 category III, and nine category IV lesions. Findings on CT and MR images were similar in 56 (81%) lesions; in 13 (19%) lesions, there were differences. In eight (12%) lesions, MR imaging depicted more septa than did CT, which resulted in an upgrade of the classification at MR imaging in two cases. In seven (10%) lesions, MR imaging depicted increased wall and/or septa thickness compared with CT, resulting in a classification upgrade in six cases. Three lesions had both increased numbers of septa and thickening of the wall and/or septa. In two (3%) lesions, enhancement characteristics at CT and MR imaging were different. One of these lesions also had an increased number of septa. Overall, MR imaging results led to a cyst classification upgrade of seven lesions, from category II to IIF (n = 2), IIF to III (n = 3), or III to IV (n = 2). Pathologic correlation in 25 lesions revealed 20 malignant and five benign lesions. CONCLUSION: CT and MR imaging findings were similar in the majority of cystic renal masses. In some cases, however, MR images may depict additional septa, thickening of the wall and/or septa, or enhancement, which may lead to an upgraded Bosniak cyst classification and can affect case management.     

Newly developed hepatocellular carcinoma (HCC) in chronic liver disease: MR imaging findings before the diagnosis of HCC

PURPOSE: The purpose of this work was to describe the initial magnetic resonance (MR) imaging findings obtained before an imaging diagnosis of overt hepatocellular carcinoma (HCC) in the chronically damaged liver. METHODS: One hundred fifty-two newly diagnosed HCCs diagnosed by dynamic computed tomography (n = 111) or by MR imaging (n = 41), in addition to digital subtraction hepatic arteriography, in 96 patients were subjected to analysis of their MR imaging features within the previous 2 years. RESULTS: Ninety-seven (64%) HCC cases showed no focal lesions distinguishable from background hepatic parenchyma in MR images taken before the indication of typical HCC. The remaining 55 (36%) lesions were readily identified in earlier images and were categorized into 3 groups: nonhypervascular lesions (category I, n = 6), lesions with partially hypervascular foci of "nodule-within-nodule" appearance (category II, n = 12), and homogeneously hypervascular and/or T2-weighted hyperintense lesions (category III, n = 37). The size and doubling time of category III lesions (0.7 cm, 154 days) were smaller and shorter than those of the other lesions (1.2 cm, 377 days). CONCLUSIONS: Before the imaging diagnosis of HCCs, the premalignant or early malignant lesions can be found on the prior MR images just in the minority of the lesions in the cirrhotic liver.     

Discrimination and anatomical mapping of PET-positive lesions: comparison of CT attenuation-corrected PET images with coregistered MR and CT images in the abdomen

Purpose

PET/MR has the potential to become a powerful tool in clinical oncological imaging. The purpose of this prospective study was to evaluate the performance of a single T1-weighted (T1w) fat-suppressed unenhanced MR pulse sequence of the abdomen in comparison with unenhanced low-dose CT images to characterize PET-positive lesions.

Methods

A total of 100 oncological patients underwent sequential whole-body ¹⁸F-FDG PET with CT-based attenuation correction (AC), 40?mAs low-dose CT and two-point Dixon-based T1w 3D MRI of the abdomen in a trimodality PET/CT-MR system. PET-positive lesions were assessed by CT and MRI with regard to their anatomical location, conspicuity and additional relevant information for characterization.

Results

From among 66 patients with at least one PET-positive lesion, 147 lesions were evaluated. No significant difference between MRI and CT was found regarding anatomical lesion localization. The MR pulse sequence used performed significantly better than CT regarding conspicuity of liver lesions (p?<?0.001, Wilcoxon signed ranks test), whereas no difference was noted for extrahepatic lesions. For overall lesion characterization, MRI was considered superior to CT in 40?% of lesions, equal to CT in 49?%, and inferior to CT in 11?%.

Conclusion

Fast Dixon-based T1w MRI outperformed low-dose CT in terms of conspicuity and characterization of PET-positive liver lesions and performed similarly in extrahepatic tumour manifestations. Hence, under the assumption that the technical issue of MR AC for whole-body PET examinations is solved, in abdominal PET/MR imaging the replacement of low-dose CT by a single Dixon-based MR pulse sequence for anatomical lesion correlation appears to be valid and robust.     

肝癌经导管肝动脉化疗栓塞后PET/CT显像的临床价值

目的 探讨18F-脱氧葡萄糖(FDG)PET/CT检查评估肝细胞肝癌(HCC)经导管肝动脉化疗栓塞(TACE)治疗后肿瘤活性及对转移灶的检出能力.方法 22例HCC患者TACE后进行18F-FDG PET/CT检查,以临床随访及部分病理结果为标准进行对照分析.结果 22例患者中,18例复发或转移,其余4例全身未见明显FDG代谢异常增高灶.16例患者肝内有1个或多个18F-FDG放射性增高灶,其中5例碘油沉积区和非碘油沉积区均有FDG浓聚灶,13例并发肝外转移病灶;2例肝内FDG显像阴性但腹膜后淋巴结放射性浓聚.转移灶分布:肺和淋巴结转移各9例,骨转移2例,门静脉瘤栓和膈脚转移各1例.经随访证实2例肝内18F-FDG显像为假阴性,18F-FDG PET/CT检查对肝内肿瘤复发或转移灶的探测灵敏度为88.9%(16/18),特异性为4/4,准确性为90.9%(20/22);全身显像对肿瘤复发或转移检测的灵敏度为94.7%(18/19),特异性为3/3,准确性为95.5%(21/22).结论 18F-FDG PET/CT显像对HCC介入治疗后的残留或复发灶探测有较高的灵敏度,对肝外转移病灶的检出具有独特的优势.