胆石性肠梗阻的影像诊断

目的研究胆石性肠梗阻影像表现及其诊断价值.方法回顾性分析15例经临床证实的胆石性肠梗阻患者的影像表现及其诊断价值.结果所有病例CT表现均见肠梗阻征象、肠腔内迷走结石（异位结石）及胆囊、胆系积气,2例显示腹腔游离积液,除1例胆囊切除者外另14例均见胆囊变形,胆囊与十二指肠分界不清,4例可见明确显示胆肠瘘.5例同时进行了腹部立卧位X线平片检查,其中1例碘水造影显示机械性肠梗阻、肠腔内充盈缺损、胆肠瘘,1例显示胆管积气,3例显示肠梗阻征象,2例未见异常.7例同时进行了腹部超声检查,均提示胆囊异常,其中3例显示胆系积气.结论胆石性肠梗阻有典型的CT表现,CT是胆石性肠梗阻最佳诊断方法,X线平片及超声可以作为筛查手段.     

胆石性肠梗阻的CT诊断

目的:评价CT对胆石性肠梗阻的诊断价值。方法:回顾性分析5例经手术证实的胆石性肠梗阻患者的CT检查资料及临床表现。结果:所有病例CT表现均见肠腔内异位结石、肠梗阻、胆系积气及胆囊窝结构紊乱,1例显示腹腔游离积液,1例结石位于十二指肠降段,1例结石位于空肠,另3例结石位于回肠。结石呈圆形或椭圆形,直径2.5~5cm,梗阻以上肠管扩张,可见气液平,1例完全性肠梗阻病例梗阻以下肠管空虚。5例术前CT诊断准确率为100%。结论:胆石性肠梗阻有典型的CT表现,CT是胆石性肠梗阻的最佳方法。     

胆囊十二指肠内瘘伴胆石性肠梗阻的CT诊断价值分析

目的:评价螺旋CT对胆囊-十二指肠内瘘伴胆石性肠梗阻的诊断价值。方法:对8例经手术证实为胆囊-十二指肠内瘘伴胆石性肠梗阻的螺旋CT表现及重建技术进行回顾性分析。结果:8例患者中,2例胆石位于十二指肠降段;2例位于空肠;1例位于空回肠交界处;另外3例位于回肠内。胆石短径为(4.70±1.20)cm,长径为(6.09±1.90)cm。胆囊-十二指肠内瘘伴胆石性肠梗阻的CT直接征象主要有瘘口的显示以及胆石位于梗阻段肠腔内;间接征象主要有胆囊及胆道积气;胆囊塌陷及胆囊与十二指肠分界模糊、结构紊乱;肠梗阻。以上两种直接征象若同时存在即可作出诊断,如一种直接征象同时伴有两种或两种以上间接征象亦可作出诊断。结论:胆囊-十二指肠内瘘伴胆石性肠梗阻具有典型的CT表现,螺旋CT能够对其作出明确诊断。     

多层螺旋CT在胆石性肠梗阻诊断中的价值

目的 探讨多层螺旋CT在胆石性肠梗阻诊断中的价值.方法 回顾分析15例经手术证实的胆石性肠梗阻病例的临床及影像资料.15例均行全腹部CT平扫、X线腹部平片和腹部超声检查.结果 多层螺旋CT显示肠梗阻共15例,不完全性小肠梗阻12例,完全性肠梗阻3例;异位结石15例,其中9例位于回肠,4例位于空肠, 1例于胆囊内及回肠内均可见结石,1例于胆囊-十二指肠瘘口及回肠内各见一结石;胆囊积气15例,胆道积气13例;胆囊窝结构紊乱15例,其中6例MPR图像清晰显示胆囊-十二指肠瘘.多层螺旋CT的诊断准确率可达100%.结论 多层螺旋CT在胆石性肠梗阻的定位和定性诊断中具有重要价值,为手术方案的制订提供影像学信息.     

胆石性肠梗阻的CT诊断

目的探讨CT对胆石性肠梗阻的诊断价值。资料与方法回顾性分析8例经手术证实的胆石性肠梗阻患者的CT检查资料。所有病例均有胆囊结石、胆囊炎病史1～10年,并经B超和临床证实,其中5例有明确胆囊炎反复发作病史。发病时患者出现持续性中上腹痛,腹胀,恶心,呕吐,3例患者出现停止肛门排气排便典型肠梗阻症状,5例患者表现为不全性肠梗阻症状。结果所有病例CT图像上均可见胆囊窝结构紊乱,邻近胃窦或十二指肠降段壁增厚,胆囊空虚,胆囊及肝内胆管积气。1例胆石位于十二指肠降段;4例结石位于空肠段,其中2例结石位于屈氏韧带处;另3例结石位于回肠末段。结石呈圆形或椭圆形,直径2．7～5．0cm,梗阻以上肠管扩张,积气积液明显,可见液平面。3例完全性梗阻病例梗阻以下肠管空虚,5例不全梗阻病例梗阻以下肠管内仍可见少量气体及液体,结肠内可见粪便气体混合影。8例均在术前经CT得到正确诊断,准确率为100％。结论CT对胆石性肠梗阻的诊断准确性高。凡65岁以上老年人出现间歇性不完全性机械性肠梗阻,特别是既往有胆道病史而无腹部手术史者,应考虑胆石性肠梗阻的可能,应行CT检查明确诊断。     

多层螺旋CT在肠梗阻病因诊断中的价值

目的 探讨多层螺旋CT在肠梗阻病因诊断中的价值.方法 49例经手术或临床明确诊断的肠梗阻患者行全腹部CT平扫和增强扫描检查,5例行三维后处理重建.由2位高年资放射医师用盲法回顾性分析其CT表现,根据CT图像上"移行带"区肠壁的厚度、密度和强化程度,肠管管腔和肠系膜区的形态和密度改变,结合病史,分析肠梗阻的病因.结果 CT提示病因诊断46例,占94%,包括肠粘连13例、肿瘤11例、疝4例、血运性肠梗阻4例、胆石2例、胃石2例、结肠内容物阻塞4例、麻痹性肠梗阻3例和阑尾炎阑尾脓肿3例.病因诊断不明或误诊3例.结论多层螺旋CT在肠梗阻病因诊断中有很高的临床应用价值,可作为临床肠梗阻诊断的首选检查方法.     

胆石性肠梗阻的诊断与治疗

目的探讨胆石性肠梗阻的诊断与治疗。方法回顾性分析6例胆石性肠梗阻患者的临床资料。结合病史、临床症状与腹部B超、X片、CT等多种影像学检查,6例患者全部术前明确诊断。结果 6例患者全部采取手术行肠切开取石,均痊愈出院。结论结合胆结石病史和肠梗阻症状,再辅以影像学检查,特别是CT检查可确诊胆石性肠梗阻。积极行肠切开取石术是解除梗阻最安全、有效的方法。     

胆囊十二指肠内瘘的CT诊断

目的：探讨MSCT对胆囊十二指肠内瘘的诊断价值。方法：回顾性分析7例胆囊十二指肠内瘘的资料,7例均行MSCT检查,使用ADW 4.5后处理工作站对图像行MPR,分析其特征性影像学表现。结果：7例MSCT直接征象：4例瘘口位于十二指肠球部,3例位于降部;瘘口内径3～19 mm,平均8 mm。间接征象：胆囊形态萎陷、壁增厚（胆囊壁厚5～10 mm,平均8 mm）;胆囊十二指肠局部黏合,轮廓模糊;均有胆道系统积气;胆囊结石异位致机械性肠梗阻（5例梗阻位于十二指肠,2例梗阻位于空肠上段）。结论：MSCT不仅可清晰分辨胆囊与十二指肠间瘘口,还可观察胆囊形态、胆肠粘连、胆系积气、胆石性肠梗阻,对指导临床治疗具有重要价值。     

胆石性肠梗阻的影像学诊断

目的探讨胆石性肠梗阻的影像诊断价值。资料与方法回顾性分析7例经手术或内镜证实的胆石性肠梗阻患者的影像资料及临床表现,影像检查包括立卧位腹部平片7例,消化道碘水造影1例,CT检查6例,MRI检查2例。结果7例患者皆有程度不等的肠梗阻表现。6例CT检查见肠腔内异位结石,7例腹部平片中2例显示肠腔内异位结石,MRI检查的2例均见肠腔内异位结石,1例消化道造影示十二指肠充盈缺损,误为肿瘤性病变。腹部平片2例见胆囊区积气,6例CT见胆囊积气、胆囊窝结构紊乱,其中2例胆囊与十二指肠内气体相通,1例MRI显示胆囊与十二指肠间有高信号液体相通。结论胆石性肠梗阻影像检查中腹部平片除明确肠梗阻外,仔细寻找肠内阳性结石会对诊断有帮助,CT与MRI均能明确诊断,价值相仿。     

多层螺旋CT对几种罕少见病因肠梗阻诊断的价值

目的 评价多层螺旋CT(MSCT)对罕少见病因肠梗阻诊断的价值.资料与方法 回顾性分析14例经手术证实的罕少见病因肠梗阻的CT征象及临床表现,CT检查包括全腹部平扫、动脉期及门静脉期增强扫描.结果 14例患者均有程度不等的肠梗阻表现.其梗阻原因分别为腹茧症2例、乙状结肠周围疝2例、闭孔疝3例、肠石1例、胆石6例.结论 MSCT检查除了能明确诊断肠梗阻外,还能明确导致肠梗阻的罕少见病因.     

Stress MR imaging for evaluation of popliteal artery entrapment

The popliteal artery entrapment (PAE) syndrome has been recognized as a cause of arterial occlusion in young people. It is the result of an anomaly of the relationship between the popliteal artery and the gastrocnemius muscle. Eight young healthy volunteers (16 legs) and six patients (10 legs) with suspected PAE underwent magnetic resonance (MR) imaging. Gradient-echo images were obtained in axial planes with the leg at rest and during active plantar flexion against resistance. Imaging at rest allowed identification of PAE signs in only one leg, which had an anomalous medial course of the popliteal artery. In the other cases, only the stress technique was able to show signal loss in the popliteal artery due to muscular compression (two legs) or the presence of accessory muscle slip around the vessel (two legs), as confirmed at surgery. MR imaging is therefore a useful technique for the diagnosis of PAE because of its capability of combining information obtainable with other modalities.     

MR imaging of muscle and tender points in fibromyalgia

Fibromyalgia is a syndrome manifested by chronic, diffuse muscu-loskeletal aching and soreness, palpable muscle tender points, and other symptoms. Standardized clinical diagnostic criteria have recently been developed. Skeletal muscle has been postulated as the end organ in this disease. Biochemical, histologic, electromyographic, and conventional radiographic studies have demonstrated no definitive abnormality. This study sought to establish whether magnetic resonance (MR) imaging could demonstrate any abnormality in these patients. Eighteen patients were entered in the study, 14 of whom were able to complete their examinations. T1 -weighted, T2-weighted, gradient-echo, and STIR (short-tau inversion-recovery) sequences were performed in all patients, with selected patients examined with T1weighted, gadopentetate dimeglu-mine-enhanced sequences. The trapezius and suboccipital regions were imaged in patients who, clinically, had active fibro-myalgia. No abnormalities could be detected. The authors conclude that the conventional MR imaging used in this study was unable to depict any primary skeletal muscle abnormality in fibromyalgia.     

Controversies in cervical spine imaging in trauma patients

No area of emergency radiology has generated as much discussion in recent years as the subject of cervical spine imaging for trauma patients. This review will be in three parts. The first will examine the indications for cervical imaging and will focus on those factors that make patients at high risk or low risk for cervical injury. The second part will discuss the merits of radiography and computed tomography as the main screening diagnostic examination. In addition to the roles of each modality in the evaluation process, such factors as efficacy of diagnosis, time (duration) of study, and cost will be discussed. Finally, the third part will explore the methods currently employed to clear the cervical spine in comatose patients.Presented at the Annual Meeting of the American Society of Emergency Radiology, Las Vegas, Nevada, 22–25 October, 2003     

Uterine contractions: Possible diagnostic pitfall at MR imaging

A total of 206 nongravid patients with various gynecologic problems underwent pelvic magnetic resonance (MR) examinations that included both sagittal T2-weighted and contrast agent–enhanced T1-weighted images. MR images were retrospectively reviewed to identify changes in endometrial configuration on serial images obtained during the same MR examination. In 20 MR examinations (all in women of reproductive age), endometrial distortion due to myometrial bulging was noted on T2-weighted or contrast-enhanced T1-weighted images. It was absent on other MR images obtained at different times. Myometrial bulging exhibited low signal intensity in 18 examinations. The finding resembled adenomyosis or leiomyoma on T2-weighted or contrast-enhanced T1-weighted images. These results evidence the presence of transient myometrial bulging and transient low-intensity myometrium in the nongravid uterus. This phenomenon is thought to represent uterine contraction. Clinicians should be aware of the potential presence of transient low-signal-intensity myometrial bulging that could present diagnostic problems in the normal uterus.     

Brodie Abscess: MR imaging appearance in 10 patients

The magnetic resonance (MR) imaging features of Brodie abscess have not yet been fully evaluated. Ten patients with Brodie abscess, eight of long bone and two of vertebra, were studied with MR imaging. Long bone abscess had a characteristic “target” appearance with four layers: (a) a center with low signal intensity on T1-weighted images and high signal intensity on T2-weighted and STIR (short-inversion-time inversion recovery) images, (b) an inner ring isointense to muscle on T1-weighted images and with high signal intensity on T2-weighted and STIR images, (c) an outer ring hypoin-tense on all images, and (d) a peripheral halo hypointense on T1-weighted images. In six of eight cases, a soft-tissue mass was found. The two vertebral abscesses had a less specific appearance, with low signal intensity on T1-weighted images and high signal intensity on T2-weighted and STIR images. Only the peripheral halo was clearly identified in both cases.     

Right-side aortic arch with aneurysm of aberrant left subclavian artery: MR imaging appearance.

Reports of aneurysms of the subclavian artery in both normal and anomalous aortic arches have been rare. The authors describe a patient with a right-side aortic arch and an aneurysm of the aberrant left subclavian artery, which, to the authors' knowledge, is a previously unreported association. At presentation, the aneurysm appeared as a calcified left superior mediastinal mass. Magnetic resonance imaging enabled preoperative diagnosis and guided surgical planning.     

MR angiography of congenital heart disease: Value of segmented two-dimensional inflow technique and maximum-intensity-projection display

Magnetic resonance (MR) angiography of the cardiovascular system was evaluated in 41 patients with congenital heart disease by using a two-dimensional (2D) inflow technique based on a magnetization-prepared gradient-echo pulse sequence with segmented k-space data acquisition and electrocardiographic gating at 0.5 T. Inversion and saturation prepulses were used to suppress stationary tissue and enhance intravascular signal. Presaturation slabs were applied where certain vascular structures had to be suppressed. Sequence parameters were optimized by evaluating signal intensity and contrast characteristics for various flip angles and inversion and saturation delay times. The heart and intrathoracic vasculature were encompassed with 40–50 overlapping sections. Both 2D angiograms and maximum-intensity-projection images were evaluated. Combining data sets acquired in the sagittal and transverse orientations provided the most satisfactory information about the pulmonary arteries. The highest signal-to-noise ratios were obtained with a flip angle of 65° and short prepulse delay times. Two-dimensional MR angiography can provide useful diagnostic information but requires a thorough understanding of in-plane and hemodynamically induced signal intensity changes.     

Adrenal tissue characterization with 0.5-T MR imaging: Value of T2*-weighted images

The authors investigated the value of magnetic resonance (MR) imaging at 0.5 T for distinguishing adrenal adenomas from adrenal metastases. The series included 23 adrenal adenomas (18 nonhyperfunctioning, five hyperfunctioning) and 23 adrenal metastases from various organs. Adrenal tumor–liver signal intensity ratios on T1-, T2-, and T2*-weighted images were calculated for adrenal tissue characterization. Adrenal adenomas were more precisely distinguished from adrenal metastases on T2*-weighted images (21 of 23, 91%) than on T2-weighted images (15 of 23, 65%). T1-weighted images were not useful for this distinction. In conclusion, T2*-weighted images were better than routine T2-weighted images for distinguishing adrenal adenomas from adrenal metastases. It can be postulated that the total signal intensity of adrenal adenomas, which contain some fat components, decreased on T2*-weighted images because of an out-of-phase effect.     

MR imaging of silicone gel–filled breast implants in vivo with a method that visualizes silicone selectively

The lack of an adequately sensitive method for detecting silicone leakage and reported serious complications due to silicone leakage were cited as justification by the U.S. Food and Drug Administration for imposing the current restrictions on silicone gel–filled breast prostheses. The authors report a new magnetic resonance imaging method for visualizing silicone leakage: the silicone-only sequence (SOS). The method uses the conventional STIR (short-inversion-time inversion-recovery) technique combined with a 1331 radio-frequency pulse train widely used for water suppression in spectroscopy. With the SOS, silicone can be imaged while signals from fat and water are suppressed. The authors used the SOS to image phantoms and normal and ruptured silicone gel–filled breast prostheses.