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1.
Cerebal hydatid cysts account for 2% of all intracranial masses. Preoperative diagnosis is important since cyst rupture and spillage may cause an anaphylactic reaction. CT is the primary modality for the diagnosis. Two forms of cerebral hydatid cysts have been reported on the basis of CT appearances: unilocular and multilocular. Demostration of the cyst wall is important for the diagnosis. MRI is superior to CT for demostrating the cyst capsule and perifocal oedema. We retrospectively reviewed the CT and MRI findings of 6 surgically proven cases of cerebal hydatid cyst and compared the two modalities on the basis of their demonstration of findings helpful in the diagnosis, such as the capsule and perifocal oedema. In 1 case CT showed the capsule. In 2 cases MRI showed a hypointense capsule around the cyst on T2-weighted images. While CT is the modality of choice, in clinical practice MRI is superior for demonstrating the cys capsule, which is a helpful findings in the diagnosis and can be used in inconculsive cases.
Correspondence to: U. Topal 相似文献
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MRI evaluation of soft tissue hydatid disease 总被引:2,自引:0,他引:2
García-Díez AI Ros Mendoza LH Villacampa VM Cózar M Fuertes MI 《European radiology》2000,10(3):462-466
Infestation in soft tissue by Echinococcus granulosus is not a common disease, and its diagnosis is based on clinical, laboratory data and radiological findings. The aim of our
retrospective study is to give an overview of the different signs and patterns shown by MRI that can be useful in characterizing
soft tissue hydatid disease. The MRI images obtained in seven patients with soft tissue and subcutaneous hydatidosis were
reviewed. Typical signs of hydatidosis were multivesicular lesions with or without hypointense peripheral ring (“rim sign”).
Related to the presence and absence, respectively, of viable scolices in the microscopic exam, daughter cysts were presented
either as high signal intensity or low signal intensity on T2-weighted images. Low-intensity detached layers within the cyst
and peripheral enhancement with gadolinium-DTPA were also presented. Atypical signs were presented in an infected muscular
cyst, a subcutaneous unilocular cyst and several unilocular cysts. Knowledge of the different patterns in MRI of soft tissue
hydatid disease can be useful in diagnosing this entity. We observed that the “rim sign” is not as common as in other locations,
and in addition, MRI seems to be of assistance when evaluating the vitality of the cysts.
Received: 27 July 1998; Revision received: 11 March 1999; Accepted: 23 April 1999 相似文献
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Y Tang Y Yamashita I Ogata T Namimoto Y Abe J Urata M Takahashi 《Radiation Medicine》1999,17(4):265-270
OBJECTIVE: The initial and follow-up CT and MRI images of ten patients with hepatic metastases from ovarian tumors were retrospectively analyzed to establish their features and sequential changes in appearance. MATERIALS AND METHODS: Ten patients with hepatic metastasis from ovarian tumors received initial and follow-up CT and MRI examinations. Six patients were followed up every two to three weeks before surgical tumor resection. Both CT and MR images were analyzed by two radiologists. RESULTS: A total of fourteen lesions were detected by CT and MRI in 10 patients. All 14 lesions were demonstrated as areas of marked hyperintensity on T2-weighted MRI. Eleven cyst-like tumors were demonstrated as round or oval low density lesions on CT and as areas of hypointensity on T1-weighted imaging. Three lesions were shown as solid masses with slightly low attenuation at the initial CT examination and slightly low or iso-intensity areas on T1-weighted imaging, and these lesions showed early peripheral globular enhancement and delayed enhancement on contrast-enhanced CT and MR imaging. Cystic formation was observed two to three weeks later after initial study in all the 3 solid lesions. Rapid subcapsular effusion, which showed obvious enhancement on delayed Gd-DTPA enhanced MR imaging, was observed in two patients. CONCLUSION: The hepatic metastatic tumor from cystic ovarian carcinoma may manifest as a well-defined cystic lesion or as a solid mass, and the solid mass shows delayed enhancement on contrast-enhanced CT and MR imaging. Furthermore, rapid cystic formation and rapid subcapsular extension is frequently seen. 相似文献
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目的 分析脑包虫病的MRI特征性表现.方法 回顾性分析18例经手术病理证实脑包虫病患者的MRI表现,总结脑包虫病的MRI诊断与鉴别诊断要点.结果 18例脑包虫病患者中囊性包虫病和泡型包虫病各9例.囊性包虫病表现为脑内大小不等的圆形长T1、长T2信号病灶,内部信号均匀一致,液体衰减反转回复(FLAIR)序列扫描其内囊液信号可被抑制;DWI序列病灶为低信号;6例病灶周围无水肿带,3例破裂包虫囊肿病灶周围有水肿带;6例病灶见囊壁显示,3例病灶囊壁显示不明显;增强扫描3例破裂包虫囊肿有环形强化,6例病灶无强化;泡型包虫病表现为脑内多发等T1、短T2簇状异常信号,病灶周围通常有类似脑肿瘤样的水肿带.病灶T2WI信号似"煤炭样"黑色的低信号,内见无数密集稍高信号的小囊泡影,小囊泡直径约1~10 mm为其特征性表现.DWI序列病灶为低信号;Gd-DTPA增强扫描后病灶均见不规则的异常环形强化.2例脑灌注成像病变为低灌注改变.结论 MRI以多方位、多参数成像的优势显示脑包虫更准确,术前诊断率更高,对临床诊治具有重要意义. 相似文献
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In this study, we reviewed the computed tomography (CT, n=9) and magnetic resonance (MR, n=5) imaging findings of 11 patients with pathologically confirmed cerebral hydatid disease. Among our patients, there were 10 cases of Echinococcus granulosus and 1 case of Echinococcus multilocularis. Common CT and MR imaging findings of E. granulosus lesions were well-defined, smooth thin-walled, spherical, homogeneous cystic lesions with no contrast enhancement, no calcification, and no surrounding edema. E. multilocularis lesions showed calcified round, solid pattern with definite margins, contrast enhancement, and surrounding edema. 相似文献
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Objective
The purpose of this study was to assess the potential role for chemical shift magnetic resonance imaging (MRI) in identifying lymphangiomas from other cystic mesenteric and retroperitoneal masses.Materials and methods
A retrospective search of radiology database identified 24 consecutive patients with mesenteric and retroperitoneal cysts (nine men, 15 women; mean age, 41 years; age range, 19-75 years) who had undergone MR which included in-phase and opposed-phase chemical shift imaging. Signal intensity (SI) decrease between in-phase and opposed-phase MR images of the cyst was evaluated qualitatively by two radiologists. Ultrasound (US), computed tomography (CT), and MRI findings of the morphological appearances of all the cystic lesions that demonstrated significant signal drop on chemical shift MR were also recorded.Results
Of mesenteric and retroperitoneal cysts, 33% (8/24) revealed qualitative decrease in intensity on opposed-phase MR images relative to that seen on in-phase images. On ultrasound, these cysts demonstrated anechoic simple fluid. Their mean CT attenuation was 13 HU (range: 5-20 HU). Signal loss on fat-suppressed T1-weighted sequences was displayed only by a single cyst. None of the lesions with qualitative SI decrease on opposed-phase MR showed suggestion of lipid on US and CT.Conclusion
The presence of intra cystic lipid detected by chemical shift MR may not be overt on cross-sectional imaging such as US and CT. Chemical shift MRI provides additional sensitivity and specificity as an imaging test for demonstration of lipid within mesenteric and retroperitoneal cysts enabling a higher diagnostic yield for lymphangioma leading to more appropriate patient management. 相似文献9.
This article briefly reviews the clinical settings and imaging findings of gynecologic/obstetric disorders presenting with abdominal pain. MR imaging is considered to be an excellent modality for the diagnosis of these disorders because of its high sensitivity to blood. Although CT allows images to be obtained within a shorter time than does MR imaging, the possibility of pregnancy should be excluded prior to the examination. Hemorrhagic ovarian cyst exhibits hyperintensity on T1-weighted images or hematocrit effect on CT or MR images. Hemoperitoneum associated with hemorrhagic cyst strongly indicates rupture of the cyst. Rupture of endometrial cysts and dermoid cysts can cause acute chemical peritonitis. In ectopic pregnancy, findings of hematosalpinx associated with strong enhancement of the tubal wall frequently contribute to the diagnosis. Torsion of the adnexa can be diagnosed by the pedicle between the ovary and uterus, and the lack of contrast enhancement. Tuboovarian abscess is recognized as a cystic mass having a thick wall that is strongly enhanced. Among complications of uterine leiomyoma, red degeneration shows characteristic MR findings, hyperintense rim on T1-WI, hypointense rim on T2-WI, and lack of contrast enhancement. Because of the high incidence of OHSS associated with normal pregnancy, CT is contraindicated. 相似文献
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肾包虫囊肿的CT诊断 总被引:1,自引:0,他引:1
目的 :探讨肾包虫囊肿及其破裂感染的CT表现及诊断意义。材料和方法 :本组 7例患者均行CT平扫与增强扫描 ,经手术病理或临床资料证实。结果 :3例单纯型囊肿 ,2例表现为肾实质内水样密度的囊性肿物 ,其边缘光滑 :4例多子囊型囊肿 ,内部含有多个更低密度子囊。 2例破裂 /感染型 ,其内外囊分离 ,1例囊腔内有塌陷折叠并且钙化的内囊膜 ;另 1例囊周水肿并增强。结论 :CT对肾包虫囊肿的定位和定性诊断、分型以及破裂感染的判断颇为准确 ,是目前诊断肾包虫囊肿安全可靠的检查方法 相似文献
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Synovial cysts of the lumbosacral spine: diagnosis by MR imaging 总被引:1,自引:0,他引:1
S S Liu K D Williams B P Drayer R F Spetzler V K Sonntag 《AJNR. American journal of neuroradiology》1989,10(6):1239-1242
Intraspinal synovial or ganglion cysts are uncommon lesions associated with degenerative lumbosacral spine disease. CT usually reveals cystic lesions adjacent to a facet joint, and they may show calcification. MR imaging of four surgically confirmed cases of intraspinal synovial cysts revealed subtle signal changes compared with CSF. Short TR/TE images showed the lesions to be slightly hyperintense in three cases and isointense in one case. Long TR/TE sequences revealed a hyperintense appearance in two cases and a hypointense appearance in the others. A peripheral rim of decreased signal on long TR/TE images probably reflects fine calcification or hemorrhage in the margins of the cysts. The multiplanar and contrast characteristics of MR make this technique well suited to the diagnosis of herniated disk, degenerative facet disease, and synovial cyst. 相似文献
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Synovial cysts of the lumbosacral spine: diagnosis by MR imaging 总被引:1,自引:0,他引:1
S S Liu K D Williams B P Drayer R F Spetzler V K Sonntag 《AJR. American journal of roentgenology》1990,154(1):163-166
Intraspinal synovial or ganglion cysts are uncommon lesions associated with degenerative lumbosacral spine disease. CT usually reveals cystic lesions adjacent to a facet joint, and they may show calcification. MR imaging of four surgically confirmed cases of intraspinal synovial cysts revealed subtle signal changes compared with CSF. Short TR/TE images showed the lesions to be slightly hyperintense in three cases and isointense in one case. Long TR/TE sequences revealed a hyperintense appearance in two cases and a hypointense appearance in the others. A peripheral rim of decreased signal on long TR/TE images probably reflects fine calcification or hemorrhage in the margins of the cysts. The multiplanar and contrast characteristics of MR make this technique well suited to the diagnosis of herniated disk, degenerative facet disease, and synovial cyst. 相似文献
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肾上腺囊肿的CT、MRI诊断 总被引:7,自引:0,他引:7
目的:探讨肾上腺囊肿的CT、MRI表现,以提高诊断的准确率。方法:回顾性分析手术病理证实的9例肾上腺囊肿的CT、MRI表现。结果:9例肾上腺囊肿,5例行CT检查:1例呈圆形,2例呈椭圆形,2例呈分叶状。平扫囊肿密度均匀,CT值15~35HU,3例囊壁有钙化;增强扫描囊内均无强化,2例囊壁呈环形强化,3例囊壁无强化。4例行MR平扫:均呈长T1长T2异常信号,并且囊内可见分隔,分隔与液体相比呈短T1短T2异常信号,厚薄均匀,边缘光滑。结论:CT、MRI是肾上腺囊肿定位、定性诊断较为可靠和准确的方法。 相似文献
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Xin-hua Jiang Hao-ming Song Qing-yu Liu Yun Cao Guo-hong Li Wei-dong Zhang 《European journal of radiology》2014
Objective
To characterize the computed tomography (CT) and magnetic resonance imaging (MRI) findings of Castleman disease of the neck.Methods
The imaging findings of 21 patients with Castleman disease of the neck were reviewed retrospectively. Of the 21 patients, 16 underwent unenhanced and contrast-enhanced CT scans; 5 underwent unenhanced and contrast-enhanced MRI scans.Results
The unenhanced CT images showed isolated or multiple well-defined homogenous mild hypodensity lesions in fifteen cases, and a heterogeneous nodule with central areas of mild hypodensity in one case. Calcification was not observed in any of the patients. In five patients, MR T1-weighted images revealed well-defined, homogeneous isointense or mild hyperintense lesions to the muscle; T2-weighted images showed these as intermediate hyperintense. Sixteen cases showed intermediate to marked homogeneous enhancement on contrast-enhanced CT or MR T1-weighted images. Of the other five cases that underwent double-phase CT scans, four showed mild or intermediate heterogeneous enhancement at the arterial phase, and homogeneous intermediate or marked enhancement at the venous phase; the remaining case showed mild and intermediate ring-enhancement with a central non-enhanced area at the arterial and venous phases, respectively.Conclusion
Castleman disease of the neck can be characterized as solitary or multiple well-defined, mild hypodensity or homogeneous intense lesions on plain CT/MR scans, and demonstrates intermediate and marked enhancement on contrast-enhanced CT/MR scans. On double-phase CT scans, Castleman disease often demonstrates mild enhancement at the arterial phase, and gradually uniform enhancement at venous phase. Double-phase enhanced CT or MRI may help to differentiate Castleman disease from other diseases. 相似文献15.
Objective
The purpose of this study was to analyze CT and MR imaging (MRI) manifestation of primary adrenal lymphoma in order to better understand of this rare disease.Materials and methods
Six patients (4 men, 2 women; median age, 65.5 years) with pathologically proven primary adrenal lymphoma were retrospectively reviewed. Imaging findings (CT&;MRI, n = 3; only CT, n = 3) were analyzed and correlated with clinical and pathologic findings.Results
All cases were pathologically proven primary adrenal diffuse large B-cell lymphoma with bilateral lesions in 3 cases respectively. Maximum diameters of the 9 lesions were 6.1–14.8 cm, median 10.5 cm. Seven lesions were round, oval or oblong, and 2 lesions irregular. Seven lesions were well-defined and 2 had ill-defined margins. Unenhanced CT density of 9 lesions and MR signal intensity of T1 weighted images of 6 lesions were similar to that of muscle, and all 6 lesions were hyperintense on T2-weighted MR images. Following intravenous injection of contrast media, 6 lesions had mild enhancement and 3 lesions had moderate enhancement on parenchymal phase imaging. Enhancement was homogenous in three, slightly inhomogeneous in four, and heterogeneous in two. Seven lesions, in 5 cases, infiltrated the adjacent tissues or organs in patients with large tumors.Conclusion
Primary adrenal lymphoma usually manifests as large, well-defined, soft-tissue masses replacing the adrenal gland with homogeneous or slightly inhomogeneous enhancement. Large tumors especially tend to infiltrate adjacent structures. 相似文献16.
Aflalo-Hazan V Rousset P Mourra N Lewin M Azizi L Hoeffel C 《European radiology》2008,18(11):2586-2593
Magnetic resonance imaging (MRI) features of 11 surgically resected pelvic tailgut cysts were analyzed with reference to histopathologic
and clinical data. Homogeneity, size, location, signal intensity, appearance and presence of septa and/or nodules and/or peripheral
rim and involvement of surrounding structures were studied. Histological examination demonstrated 11 tailgut cysts (TGC),
including one infected TGC and one TGC with a component of adenocarcinoma. Lesions (3–8 cm in diameter) were exclusively or
partly retrorectal in all cases but one, with an extension down the anal canal in five cases. Lesions were multicystic in
all patients but one. On T1-weighted MR images, all cystic lesions contained at least one hyperintense cyst. The peripheral
rim of the cystic lesion was regular and non or moderately enhancing in all cases but the two complicated TGC. Nodular peripheral
rim and irregular septa were seen in the degenerated TGC. Marked enhancement of the peripheral structures was noted in the
two complicated TGC. Pelvic MRI is a valuable tool in the preoperative evaluation of TGC. 相似文献
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Hydatid disease of the soft tissues forms a rare mass lesion of the extremities. Two cases of primary hydatid disease in
soft tissues are presented with MR imaging findings. A cystic mass with multiloculated or multicystic appearance was identified
on MR images in both cases. The lesions were surrounded by a rim with two layers representing a collageneous and a vascularized
pericyst. The contrast-enhanced images demonstrated the vascularized component of the wall clearly in the first case. In diagnosis
of hydatid disease and in its differentiation from other cystic lesions of the extremities, we think that the described MR
appearances can be used confidently.
Received: 8 April 1998; Revision received: 20 July 1998; Accepted: 24 August 1998 相似文献
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目的:分析颈部囊性病变的多排螺旋CT和MRI影像学特征。方法回顾性分析41例经病理证实的颈部囊性病变的解剖部位及多排螺旋CT和MRI影像学征象。结果颈部囊性病变多形状规则,边界清晰。20例甲状舌管囊肿位于正中线舌骨水平或略偏,与甲状软骨关系密切,MRI征象为长 T1长 T2信号,信号均匀,增强扫描囊壁轻度强化;11例第二腮裂囊肿位多于胸锁乳突肌前内侧,MRI为囊性长T1长T2信号,信号均匀,囊肿内CT值为水样密度,增强扫描囊壁轻度强化;2例表皮样囊肿位于颈中线舌骨水平、颈后部,CT扫描密度均匀,增强未见明显强化;4例会厌囊肿位于会厌前间隙内,MRI影像为囊性长T1长T2信号肿块,信号均匀,CT影像为囊性薄壁低密度肿块,密度均匀;4例淋巴管瘤主要位于颈后三角区,MRI肿块呈等T1长T2信号,内部可见分隔,囊腔大小不等,增强扫描其分隔可见强化。结论颈部不同囊性病变的解剖位置和影像学征象有一定的特点,经过综合分析,可以做出正确诊断。 相似文献
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脊柱包虫病的MRI诊断(附三例报告) 总被引:1,自引:0,他引:1
作者报告3例经手术证实的脊柱包虫囊肿的MRI表现,其特征性表现为:(1)卵圆形或圆形水样信号囊肿;(2)母囊内有子囊;(3)连续低信号囊壁;(4)囊膜分离征。还对本病的诊断和鉴别诊断进行了扼要的讨论。 相似文献