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1.
《Diagnostic and interventional imaging》2013,94(11):1133-1139
The purpose of this presentation is to allow the radiologist to discuss the diagnosis of retroperitoneal schwannoma, involving mostly a fortuitous discovery and a misleading clinical presentation. We present 4 cases of retroperitoneal schwannoma, two having benefited from a surgery and two others of a therapeutic abstention. The retropritoneal localization and the imaging are good indicator elements of this pathology. The constant improvement of the CT and MR imaging allows a better approach of this entity also by specifying its localization and its anatomical relationships to guide the therapeutic attitude which must be remain mutidisciplinary. 相似文献
2.
F. Kulali A. Semiz-Oysu M. Demir M. Segmen-Yilmaz Y. Bukte 《Diagnostic and interventional imaging》2018,99(5):301-309
Purpose
The purpose of this study was to describe the magnetic resonance imaging (MRI) findings including diffusion-weighted MRI of nonfunctional pancreatic neuroendocrine tumors (PanNETs) and their hepatic metastases, and investigate the relationships between MRI features and histopathological findings for each grade of PanNETs.Materials and methods
A total of 30 patients were included. There were 14 men and 16 women with a mean age of 61.60 ± 11 (SD) years (range: 31–81 years). PanNET lesions were analyzed qualitatively (signal intensities, contrast enhancement, lesion margins, presence of metastasis and characteristics of metastases) and quantitatively (signal intensity ratios, contrast enhancement indices and normalized apparent diffusion coefficient [ADC]). The relationships between MRI findings and histopathological findings were evaluated.Results
Among 30 nonfunctional PanNETs, 11 were high-grade tumors, 10 were intermediate and 9 were low-grade tumors. All high grade PanNETs showed low to intermediate signal on T2-weighted images and ill-defined borders. All intermediate grade PanNETs had intermediate and 6 low grade PanNETs have high signal on T2-weighted images. Patients with hepatic metastases from high grade PanNETs had cystic component in 8/10 (80%) and wash-out in 7/10 (70%) whereas intermediate grade PanNETs had none (P < 0.05). The normalized ADC values of high grade PanNETs was lower than those of intermediate and low grade PanNETs (P < 0.05).Conclusion
The presence of cystic component or contrast wash-out in hepatic metastases correlates with high grade PanNETs. The pre-operative MRI combined with DWI has an important role in grading and surgical planning of PanNETs. 相似文献3.
4.
O. Kilickesmez O. Onerci Celebi M. Yalcinkaya A.R. Gokduman Y. Karagoz O. Yigit 《Diagnostic and interventional imaging》2018,99(2):65-72
Purpose
To assess the relationships between mucosal thickness, T1-weighted, T2-weighted signals and restricted diffusion on magnetic resonance imaging (MRI) with the degree of symptoms in patients with incidentally detected inflammatory sinonasal disease.Materials and methods
Conventional and diffusion-weighted MRI of 100 patients with incidental sinonasal mucosal thickening were prospectively evaluated. There were 53 men and 47 women, with a mean age of 44.6 years ± 15.17 (SD) (range: 18–81 years). Correlations between quantitative values (T1-signal, T2-signal and apparent diffusion coefficient [ADC]) and three different quality of life questionnaires (chronic sinusitis survey, sinonasal outcomes test-22 and nasal obstruction and septoplasty effectiveness scale [NOSE]) were searched using the Spearman correlation test.Results
The mean SNOT-22 score was 35.81 ± 20.36 (SD) (range: 0–83), CSS score was 4.64 ± 3.42 (SD) (range: 0–14), and NOSE score was 5.91 ± 4.84 (range: 0–18). All patients (100%) had maxillary sinus involvement. Ethmoidal sinus involvement was present in 57% of patients, frontal sinus involvement in 33% and sphenoidal sinus involvement in 27%. Morphologically, 40 patients (40%) had septal deviation, 41 (41%) had maxillary sinus retention cyst and 78 (78%) had hypertrophy of the conchae. No correlations were found between morphological abnormalities, quantitative values and patient scores in none of the questionnaires.Conclusion
Incidental morphological abnormalities or restricted diffusion of the paranasal sinuses on MRI do not correlate with the degree of symptoms in patients with incidentally detected inflammatory sinonasal disease. 相似文献5.
6.
Thoracoscopic resection of mediastinal cystic schwannoma 总被引:1,自引:1,他引:0
F. Facciolo A. Sposi M. Catarci G. Della Rocca M. Carboni C. Ricci 《Surgical endoscopy》1993,7(5):447-449
Summary Mediastinal cystic schwannoma is of very rare occurrence. Our patient came with chest pain of 6 months duration. Abnormal shadow on chest x-ray was found. A sharp dissection space was evident by computed tomography (CT-scan) and magnetic resonance imaging (MRI) between the tumor, the left pulmonary artery, and the descending aorta. The patient underwent surgical removal using thoracoscopic surgery. Postoperative discomfort was markedly reduced and hospitalization short. We can conclude that interventional thoracoscopy is a safe, well-tolerated procedure, with excellent therapeutic potentials. 相似文献
7.
P. Lavaud B. Fedida G. Canlorbe S. Bendifallah E. Darai I. Thomassin-Naggara 《Diagnostic and interventional imaging》2018,99(6):387-396
Objective
To retrospectively investigate whether magnetic resonance imaging (MRI) findings could contribute to predict histologic type, tumor grade and lymphovascular space invasion (LVSI) to improve preoperative assessment of endometrial cancer using the European Society for Medical Oncology (ESMO) European Society for Radiotherapy & Oncology (ESTRO) and European Society of Gynecological Oncology (ESGO) classification.Methods
Between January 2008 and August 2014, 104 women (mean age, 65 ± 11 [SD] years; range, 32–84 years) with International Federation of Gynecology and Obstetrics (FIGO) stage I endometrial cancer underwent preoperative MRI of the pelvis. Two independent readers evaluated tumor heterogeneity and measured tumor size on T2-weighted, diffusion-weighted and T1-weighted images obtained after gadolinium chelate administration at 2 minutes. The apparent diffusion coefficient (ADC) was generated from pixel ADC from the whole tumor volume.Results
A short axis > 24 mm on MRI was associated with histopathologic type 2, grade 3 tumor and presence of LVSI (P < 0.01). There were no significant differences in minimum, mean and maximum ADC between presence/absence of LVSI. In 9.1% women (9/99), the accuracy of the ESMO-ESGO-ESTRO classification with the inclusion of the MRI short-axis criterion was higher than that of the conventional ESMO classification to predict high-risk recurrence endometrial cancer (P = 0.02).Conclusion
Tumor size reflects histologic type, tumor grade and LVSI in endometrial cancer. FIGO stage 1 endometrial cancer > 24 mm should be classified preoperatively in the high-intermediate or high-risk recurrence risk groups. 相似文献8.
Satoshi Imaizumi Tetsuro Morita Akira Ogose Tetsuo Hotta Hiroto Kobayashi Takui Ito Yasuharu Hirata 《Journal of orthopaedic science》2002,7(1):33-37
We report six patients with soft tissue sarcoma mimicking traumatic hematoma. The lesions in these patients, showed huge
hematomas and were characterized by rapid growth. Cytology of percutaneous; aspiration biopsy samples was performed in all
six patients; however, in five patients, findings for malignant cells were negative. Consequently, they were misdiagnosed,
resulting in a poor prognosis. We conducted a retrospective study in which we evaluated the clinical findings, the magnetic
resonance (MR) images, and computed tomography (CT) scans of the soft tissue sarcomas forming huge hematomas in the lesion.
MR imaging revealed the fine tumor mass with enhancement and characterized the hematoma in the lesion in a more precise fashion
than did CT. We conclude that MR imaging is a suitable method for differentiating these soft tissue sarcomas from chronic
traumatic hematoma.
Received: May 22, 2001 / Accepted: September 12, 2001 相似文献
9.
Abdelkarim Rhanim Rachid El Zanati Mustapha Mahfoud Mohammed Saleh Berrada Moradh El Yaacoubi 《Journal of Clinical Orthopaedics and Trauma》2013,4(2):89-92
Schwannomas are common, benign tumors of the shelth of peripheral nerves. Sciatic schwannomas are rare. Their symptomatology usually mimics sciatic pain due to a herniated disc, which can delay the diagnosis. If there is no lumbar pain and lumbar MRI is normal, the sciatic nerve must be clinically and radiologically examined all along its course. We report a case of sciatic nerve schwannoma presenting with chronic sciatica which was diagnosed and monitored radiologically for several years before successful surgical resection. 相似文献
10.
Okuma T Hirota M Nitta H Saito S Yagi T Ida S Okamura S Chikamoto A Iyama K Takamori H Kanemitsu K Baba H 《Surgery today》2008,38(3):266-270
Among pancreatic neoplasms, pancreatic schwannoma is quite rare. We report a case of solitary pancreatic schwannoma, plus
a literature review of this tumor. A 71-year-old woman was diagnosed by abdominal ultrasonography as having a pancreatic tumor
and was hospitalized in our department at Kumamoto University Hospital on January 26, 2006. Abdominal computed tomography,
magnetic resonance imaging, and endoscopic ultrasonography all showed this tumor, which was located in the body of the pancreas,
to have cystic and solid components, and with a septum in the cystic part of the lesion. The tumor, preoperatively identified
as a mucinous cystic neoplasm, was clearly separated from the normal pancreatic parenchyma. We performed a spleen-preserving
distal pancreatectomy with a lymph node dissection on February 7, 2006. A histopathological examination of the resected specimen
by means of hematoxylin and eosin revealed the tumor to consist of two parts: one with a compact spindle cell pattern (Antoni
type A), and the other showing degeneration of fat (Antoni type B). We also found positive results for immunohistochemical
staining for S-100 and vimentin. These findings confirmed the tumor’s classification as a pancreatic schwannoma. 相似文献
11.
S. Sun P.A. Bonaffini S. Nougaret L. Fournier A. Dohan J. Chong J. Smith H. Addley C. Reinhold 《Diagnostic and interventional imaging》2019,100(10):619-634
Uterine leiomyomas, the most frequent benign myomatous tumors of the uterus, often cannot be distinguished from malignant uterine leiomyosarcomas using clinical criteria. Furthermore, imaging differentiation between both entities is frequently challenging due to their potential overlapping features. Because a suspected leiomyoma is often managed conservatively or with minimally invasive treatments, the misdiagnosis of leiomyosarcoma for a benign leiomyoma could potentially result in significant treatment delays, therefore increasing morbidity and mortality. In this review, we provide an overview of the differences between leiomyoma and leiomyosarcoma, mainly focusing on imaging characteristics, but also briefly touching upon their demographic, histopathological and clinical differences. The main indications and limitations of available cross-sectional imaging techniques are discussed, including ultrasound, computed tomography, magnetic resonance imaging (MRI) and positron emission tomography/computed tomography. A particular emphasis is placed on the review of specific MRI features that may allow distinction between leiomyomas and leiomyosarcomas according to the most recent evidence in the literature. The potential contribution of texture analysis is also discussed. In order to help guide-imaging diagnosis, we provide an MRI-based diagnostic algorithm which takes into account morphological and functional features, both individually and in combination, in an attempt to optimize radiologic differentiation of leiomyomas from leiomyosarcomas. 相似文献
12.
锁骨骨折手术安全性分区的MRI影像解剖学研究 总被引:1,自引:0,他引:1
目的 通过MRI影像解剖学方法研究锁骨骨折手术安全性分区. 方法用核磁共振对13例志愿者锁骨邻近结构进行矢状位和冠状位图像采集.分别测量锁骨下静脉、臂丛神经束移行至锁骨下方时在锁骨投影A点和B点至胸锁关节的距离,以确定具体位置.同时测量钻孔安全深度和安全角度. 结果 A点对应的体表标志为锁骨中内1/3交点(M点);B点对应的体表标志为锁骨全长中点(N点).将锁骨依据手术安全性分区进行如下划分,Ⅰ区为危险区:SJ点(胸锁关节)到M点;Ⅱ区为相对危险区:M点到N点;Ⅲ区为相对安全区:N点到CP'点(喙突在锁骨投影);Ⅳ区为安全区:CP'点到AJ点(肩锁关节).从Ⅰ区至Ⅳ区钻孔安全深度和安全角度数值依次递增. 结论研究锁骨手术安全性分区,可以有效避免手术时的锁骨下神经血管束损伤,降低术中风险. 相似文献
13.
目的探讨护士提前应用呼吸训练对肺部感染者在磁共振(MRI)检查中的应用成效。
方法选取2013年1月至2015年1月本院拟接受MRI检查的肺部感染者85例。随机将患者分为观察组和对照组,其中观察组43例,对照组42例;观察组患者中男性27例,女性16例,对照组患者中男性27例,女性15例。观察组平均年龄为(56.0±3.8)岁,对照组平均年龄为(56.4±3.3)岁。两组患者均根据病情需要给予基础护理和呼吸评估,观察组在此基础上,在MRI检查前120 min开始接受呼吸训练,比较两组患者MRI的图像质量及检查耗时。
结果两组患者均完成MRI检查,观察组患者MRI检查图像质量显著优于对照组(U = 3.85、P = 0.000);观察组患者的图像合格率显著高于对照组(97.67% vs. 76.19%,χ2 = 8.704、P = 0.003)。两组患者行MRI平扫,观察组患者耗时显著短于对照组(11.3±1.7 min vs. 14.2±2.2 min,t =-6.81、P = 0.002)。行动态增强扫描,观察组患者检查时长显著短于对照组(4.1±1.0 min vs. 4.1±1.0 min,t =-3.92、P = 0.005)。
结论呼吸训练能够提高患者行MRI检查时的配合度,从而减少由自主性运动引起的MRI图像伪影,提高成像质量,减少检查时间,对小病变的检出率以及临床诊断和鉴别诊断有实际意义。 相似文献
14.
Magnetic resonance imaging with magnetic resonance cholangiopancreatography accurately predicts resectability of pancreatic carcinoma 总被引:6,自引:0,他引:6
Steven N. Hochwald M.D. Neil M. Rofsky M.D. Michael Dobryansky B.A. Peter Shamamian M.D. Stuart G. Marais M.D. 《Journal of gastrointestinal surgery》1999,3(5):506-511
Accurate preoperative staging of pancreatic malignancy aids in directing appropriate therapy and avoids unnecessary invasive
procedures. We evaluated the accuracy of magnetic resonance imaging (MRI) with magnetic resonance cholangiopancreatography
(MRCP) in determining resectability of pancreatic malignancy. Twenty-one patients with suspected pancreatic malignancy underwent
dynamic, contrast-en-hanced breath-hold MRI with MRCP prior to surgical evaluation. Results of this study were correlated
with operative results and pathologic findings. The sensitivity, specificity, and accuracy of MRI with MRCP in detecting a
mass, determining the nature of the mass, and predicting lymph node involvement and resectability were determined. MRI with
MRCP correctly identified the presence of a pancreatic mass in all 21 of these patients. Following pathologic correlation,
it was determined that MRI with MRCP was 81 % accurate in determining the benign or malignant nature of the pancreatic mass
and 43% accurate in predicting lymph node involvement. In predicting resectability, MRI with MRCP had a sensitivity of 100%,
specificity of 83%, positive predictive value of 94%, negative predictive value of 100%, and accuracy of 95%. MRI with MRCP
is an accurate, noninvasive technique in the preoperative evaluation of pancreatic malignancy. Information obtained from MRI
with MRCP including identification of a mass and predicting tumor resectability may be of value in staging and avoiding unnecessary
invasive diagnostic procedures in patients with pancreatic cancer.
Presented at the Thirty-Ninth Annual Meeting of The Society for Surgery of the Alimentary Tract, New Orleans, La., May 17–20,
1998. 相似文献
15.
J. Seroussi C. Hautefort A. Gillibert R. Kania J.-P. Guichard H. Vitaux P. Herman E. Houdart A. Attyé M. Eliezer 《Diagnostic and interventional imaging》2018,99(11):679-687
Purpose
To report the postoperative magnetic resonance imaging (MRI) features after superior semicircular canal plugging in patients with Minor syndrome.Materials and methods
The MRI examinations with 3D T2-weighted SPACE sequence of 12 patients with superior semicircular canal dehiscence syndrome (SCDS) were retrospectively assessed. Two radiologists independently evaluated the presence of a filling defect of the superior semicircular canal above the superior ampulla and the common crus using an oblique plane parallel to the superior semicircular canal (Pöschl's plane).Results
Postoperative MRI showed a filling defect above the ampulla of the superior semicircular canal and the common crus in 8/12 patients (67%). Three patients (3/12; 25%) had a filling defect involving also the superior ampulla that caused postoperative labyrinthitis with labyrinthine enhancement on MRI in 2 patients. One patient (1/12; 8%) had incomplete plugging of superior semicircular canal with abnormal functional tests and remaining symptoms.Conclusion
Postoperative MRI shows a normal plugging aspect of the superior semicircular canal in 67% of patients. MRI can reveal complications that may have therapeutic implications. 相似文献16.
MR指纹技术(MRF)可快速获取定量图像及后处理,其数据采集、后处理及可视化程序设计新颖,可在一次扫描中提供高度可重复的多参数量化图,具有成像时间短、容错率高及成像数据易被计算机识别处理等诸多优势,在临床应用中具有广阔的前景。本文对MRF在医学影像诊断的应用进行综述。 相似文献
17.
S. Thakran P.K. Gupta V. Kabra I. Saha P. Jain R.K. Gupta A. Singh 《Diagnostic and interventional imaging》2018,99(10):633-642
Objectives
The objective of this study was to quantify the hemodynamic parameters using first pass analysis of T1-perfusion magnetic resonance imaging (MRI) data of human breast and to compare these parameters with the existing tracer kinetic parameters, semi-quantitative and qualitative T1-perfusion analysis in terms of lesion characterization.Materials and methods
MRI of the breast was performed in 50 women (mean age, 44 ± 11 [SD] years; range: 26–75) years with a total of 15 benign and 35 malignant breast lesions. After pre-processing, T1-perfusion MRI data was analyzed using qualitative approach by two radiologists (visual inspection of the kinetic curve into types I, II or III), semi-quantitative (characterization of kinetic curve types using empirical parameters), generalized-tracer-kinetic-model (tracer kinetic parameters) and first pass analysis (hemodynamic-parameters). Chi-squared test, t-test, one-way analysis-of-variance (ANOVA) using Bonferroni post-hoc test and receiver-operating-characteristic (ROC) curve were used for statistical analysis.Results
All quantitative parameters except leakage volume (Ve), qualitative (type-I and III) and semi-quantitative curves (type-I and III) provided significant differences (P < 0.05) between benign and malignant lesions. Kinetic parameters, particularly volume transfer coefficient (Ktrans) provided a significant difference (P < 0.05) between all grades except grade-II vs III. The hemodynamic parameter (relative-leakage-corrected-breast-blood-volume [rBBVcorr) provided a statistically significant difference (P < 0.05) between all grades. It also provided highest sensitivity and specificity among all parameters in differentiation between different grades of malignant breast lesions.Conclusion
Quantitative parameters, particularly rBBVcorr and Ktrans provided similar sensitivity and specificity in differentiating benign from malignant breast lesions for this cohort. Moreover, rBBVcorr provided better differentiation between different grades of malignant breast lesions among all the parameters. 相似文献18.
M. Eliezer G. Poillon C. Maquet A. Gillibert J. Horion J.-P. Marie J.-P. Guichard N. Magne A. Attyé 《Diagnostic and interventional imaging》2019,100(5):259-268
Purpose
The purpose of this study was to assess whether the volume of the vestibular endolymphatic space correlates with the degree of hearing loss using heavily T2-weighted fast imaging employing steady-state acquisition with cycle phase (FIESTA-C) MRI.Materials and methods
A total of 23 patients with vestibular schwannoma, as diagnosed on typical image findings, who underwent FIESTA-C MRI were included. There were 13 women and 10 men with a mean age of 63.5 ± 9.3 (SD) years (range: 49–88 years). Two radiologists independently evaluated the volume of the utricle and saccule. Correlation between tumor volume, vestibular endolymphatic space volume and degree of hearing loss – as evaluated with the levels of pure-tone average and speech recognition threshold – were searched for.Results
The mean saccular, utricular and tumor volumes were 3.17 ± 1.1 (SD) mm3 (range: 1.45–5.7 mm3), 14.55 ± 5 (SD) mm3; (range: 6.6–23.9 mm3) and 17.4 ± 5.5 (SD) mm3; (range: 8.3–25.4 mm3), respectively. There was a moderate correlation between the volume of the utricle and the degree of hearing loss as evaluated with the levels of pure-tone average (rho = 0.5; P = 0.015) and speech recognition threshold (rho = 0.58; P = 0.004). There were no significant correlations between saccular and tumor volumes and the degree of hearing loss.Conclusion
The volume of the utricle in patients with obstructive vestibular schwannoma moderately correlates with the degree of hearing loss. 相似文献19.
Peter H. Gorman M.D. Daniele Rigamonti M.D. John N. Joslyn M.D. 《Surgical neurology》1989,32(6):459-462
Intramedullary schwannomas and neurofibromas are rare tumors. Only two cases have been reported as having both an intramedullary and extramedullary component.
We have managed the case of a 15-year-old girl with a schwannoma that appeared to track along the sensory nerve root into the spinal cord. The clinical presentation in this case was that of motor weakness and atrophy, sensory abnormalities, and, late in the course, pain.
Magnetic resonance imaging with gadolinium enhancement was better than myelography and computed tomography at delineating the intramedullary extent of the tumor. The tumor was removed microsurgically at two operative sittings. Reports of this unusual pathology are reviewed. 相似文献
20.
Aylin Pelin Cil M. Murad Basar Simay Altan Kara Pinar Atasoy 《International urogynecology journal》2008,19(5):735-737
Benign cystic lesions of the vagina are uncommon and may become symptomatic. We describe two symptomatic anterior vaginal
wall cysts in a virgin patient and the usefulness of imaging modalities. A 36-year-old virgin woman presented with a complaint
of vaginal bulging and pelvic pressure. Pelvic examination revealed a cystic mass protruding from the vagina surrounded by
the intact hymen. The initial abdominopelvic ultrasound showed a hypoechoic cystic mass measuring 42 × 20 mm in the vagina.
She then had a pelvic magnetic resonance imaging (MRI) that revealed two anterior vaginal wall cysts with no communication
with the urethra or bladder. The cysts were excised and histologic examination with mucicarmine revealed mucin-secreting tall
columnar cells consistent with a diagnosis of mullerian cyst. While both ultrasonographic examination and MRI are helpful
in localizing vaginal cysts, MRI is superior in showing multiple cystic lesions of the vagina and their communication with
the surrounding structures. 相似文献