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Objective To explore the value of dynamic contrast -enhanced magnetic resonance imaging in differential diagnosis of benign and malignant ovarian tumors .Methods 50 patients with benign ovarian cancer were selected as the benign group ,and 50 patients with malignant ovarian cancer were selected as the malignant group .All patients underwent dynamic contrast-enhanced magnetic resonance imaging .Results The difference of the time intensity curve ( TIC) curve between the benign group and the malignant group was no statistically significant ( P<0.05),the benign group was mainly type Ⅰ curve,and the malignant group was dominated by type Ⅲ curve.The values of Ve,Kep and Ktrans in the benign ovarian tumors [(0.492 ±0.227),(0.163 ±0.081)min-1,(0.071 ± 0.034) min-1 ] were significantly lower than those in the malignant group [( 0.686 ±0.153 ), ( 0.411 ± 0.214)min-1,(0.282 ±0.110)min-1](P<0.05).The ROC curve under the area of Ve value,Kep value,Ktrans value to identify ovarian benign and malignant were 0.707,0.942,1.000;the best differential value of Ve ,Kep, Ktransfor ovarian benign and malignant tumors were 0.118min-1,0.257min-1,0.546,respectively.The Jorden index,sensitivity,specificity,positive predictive value,negative predictive values of the diagnosis of the ovarian benign and malignant tumors were 0.446,88.84％,57.23％,63.24％and 86.12％,respectively.The Jorden index,sensitivity, specificity,positive predictive value ,negative predictive values of Kep in the diagnosis of ovarian benign and malignant tumors were 0.804,88.91％,90.87％,89.15％and 90.78％,respectively.The Jorden index,sensitivity,specificity, positive predictive value ,negative predictive values of Ktrans in the diagnosis of ovarian benign and malignant tumors were 1.000,100.0％,100.0％,100.0％,100.0％.Conclusion Dynamic contrast -enhanced magnetic resonance imaging has differential diagnosis value on benign and malignant ovarian tumors .The ovarian benign tumors are mainly type Ⅰcurve,and the ovarian malignant tumors is mainly type Ⅲcurve.Ktrans is the best for differential diagnosis of ovarian benign and malignant tumors .
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Objective To compare the clinical value of dynamic enhanced CT,MRI in differential diagnosis of adrenal tumors.Methods 62 patients with adrenal tumor by pathologically confirmed in our hospital were select-ed.All patients underwent unenhanced and dynamic enhanced CT,MRI examination.The qualitative and adrenal tumor localization diagnostic accuracy,the adrenal adenomas and non adenoma tumor clearance rate of the two meth-ods were compared.Results The accuracy of enhanced CT positioning,qualitative examination were 96.77%, 90.57%,respectively,which were slightly higher than those of the MRI enhancement(91.94%,86.79%),but the differences were not statistically significant (χ2 =0.479,0.376,all P >0.05).53 adrenal adenomas and 9 cases non-adenomas absolute and relative clearance rate clearance rate in enhanced CT 5 min delay time,the differences were statistically significant (t =2.962,2.018,all P <0.05).53 cases adrenal adenomas and 9 cases non adenoma clear-ance of correction in the enhanced MRI delay 5min,respectively (33.41 ±20.17)%,(14.74 ±12.16)%,the differ-ence was statistically significant (t =2.684,P <0.05).Conclusion Dynamic enhanced CT,MRI are good methods for differential diagnosis of adrenal tumors,two methods have location and qualitative diagnosis correct rate.So dynamic enhanced CT,MRI are reliable means of diagnosis of adrenal tumors.
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Objective To stuay CT findings of adrenal gland trauma(AGT).Methods The CT images of adrenal gland trauma which were found in 1712 patients who had emergency abdominal CT examinations for assessment of blunt force trauma were analyzed restrospectively.Results Among 1712 cases.we identified 29 patients(1.7%)with adrenal gland traumatic lesions.A total of 32 lesions were found.Twenty-six lesions were unilateral(23 right-sided,3 left-sided),and 3 cases were bilateral(6 lesions).Main CT findings were as followed:(1)Adrenal hematomas appeared as discrete round or oval masses expanding the adrenal gland in 22 patients with 25 lesions.The lesions were hyperdense or of homogeneous density in plain scan and did not enhance in three-phase contrast-enhanced dynamic scan.The splayed adrenal limbs around hematoma were enhanced significantly as eurvilinear structures.(2)Mild to moderate uniform swelling of gland was shown in 4 cases.(3)Diffuse irregular hemorrhage obliterating the gland was shown in 3 cases.Contrast extravasation was shown in 1 case,which was active bleeding from the broken adrenal gland proven by operation.Associated CT findings included strand-like hemorrhage of the periadrenal fat and posterior pararenal hemorrhage mimicking thickened diaphragmatic crus.The concurrent injuries of ipsilateral thorax or/and abdomen were found in 25 patients.Conclusion The AGT has typical CT findings.Familiarity with characteristic CT findings of adrenal trauma is essential for the radiologist to avoid misdiagnosis.
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Objective To explore the value of multi-model reconstruction of 16-slice spiral CT in diagnosis of rib fractures.Methods 16-slice spiral CT volumetric scanning was performed in 72 patients with rib fracture proved by clinical,all images were reconstructed in thin slice and transferred into ADW4.1 workstation.Images such as multiplanar reconstruction(MPR),maximum intensity projection(MIP)and volume rendering(VR)were performed,then the reconstructed images of injured ribs were observed and analyzed by two experienced radiologists and compared with radiographs.Results In 72 cases,there were 217 rib fracture and 7 costal cartilage fracture depicted on MSCT.The location and number of fracture and displacement of fracture could be showed clearly on images of multi-model reconstruction.VR images were betten in demonstration of the anatomical structure,MPR images were better to show the minor lesion of rib fracture,MIP was the best imaging method in detecting the costal cartilage fracture,while axial image was the basic CT scanning section.Radiographs revealed 169 rib fractures but no costal cartilage fracture.Conclusion 16-slice spiral CT of multi-model reconstruction is superior to radiography in diagnosis of rib fracture and costal cartilage fracture.But the combinalion of various reconstruction techniques should be acquired.