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Objective To compare the appearances between chronic mastitis and breast cancer on MRI and investigate the differ-ential diagnostic value.Methods MRI data of 20 patients with chronic mastitis pathologically proved by biopsy or operation were ret-rospectively analyzed.30 cases of breast cancer were contemporaneously chosen as the control group.Morphological feature and dy-namic contrast-enhanced(DCE)manifestation of the lesions were evaluated and statistical difference was compared between mastitis and breast cancer.Morphological feature included configuration,spiculated sign,ring-like enhancement,peri-focal edema,skin thick-ening,nipple involvement and axillary lymph nodes enlargement.DCE manifestation contained calculating early enhancement ratio and drawing time-intensity curve (TIC).Results There were significant statistical differences among configuration,ring-like en-hancement and peri-focal edema between mastitis and breast cancer,respectively.No statistical differences could be found among spiculated sign,skin thickening,nipple involvement and axillary lymph nodes enlargement.Early enhancement ratio in the group of mastitis was 1.1 56±0.635 while 1.253±0.499 in the group of breast cancer and there was no statistical difference between them. There were 1 1 cases with type Ⅰ TIC,6 with type Ⅱ,3 with type Ⅲ in the lesions of mastitis,while 4 with type Ⅰ,1 1 with typeⅡ,1 5 with type Ⅲ in the lesions of breast cancer and significant statistical differences could be found between two groups.Conclu-sion Mastitis usually manifests as non-mass-like lesions on MRI.Ring-like enhancement,peri-focal edema and benign type TIC can be applied to discriminate mastitis from breast cancer.
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Objective To analyze MRI imaging features of patients with Wernicke encephalopathy after major surgical operation.Methods Clinical data including cranial MRI features were reviewed on five patients of Wernicke encephalopathy after major surgical operation from Jan 2012 to Nov 2013.Results The clinical features of patients with Wernicke encephalopathy after major surgical operation were noncharacterized and most of them had no specific value for diagnosis except for a definite history of vit B1 insufficiency.MRI imaging showed abnormal signal in the medial thalamus,third ventricle,surrounding area of the aqueduct of midbrain,column of fornix and the dorsal midbrain and pons ; Lesions were showed with long T1 and long T2 signal intensity and high signal intensity on fluid-attenuated inversion recovery (FLAIR),and high signal intensity on DWI(b equals 1 000 s/mm2).ADC value in all lesions increased from [(0.46-0.59) ×10-3 mm2/s] before treatment to [(0.81-1.10) ×10-3 mm2/s] after vit B1 supplement.Conclusions Wernicke encephalopathy has typical MRI imaging presentations.Early diagnosis and timely supplement of vitamin B1 can improve the prognosis.
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0.05).Results No side effect was recorded.100% of images were with excellent quality.Conclusion Patients with previous endovascular stent surgery can receive 1.5T high field MRI examination safely.Usually the examination can be performed in 4~8 weeks after the surgery,but in special case,earlier examination is also acceptable.
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Objective To evaluate the magnetic resonance angiography(MRA) in senile lower extremity arterial disease and to compare the diagnostic value of two dimensional time of flight(2D TOF) with three dimensional contrast enhancement(3D CE) technique. Methods Seventy patients with a mean age of 75 years underwent MRA for suspected acute or chronic lower extremity arterial disease. MRA was performed with a 1 5 T MR scanner and Gd DTPA was used by manual injection in 3D CE MRA. Among 52 patients examined with 2D TOF MRA, 18 of them underwent an additional 3D CE MRA, 32 patients took Doppler ultrasound examination, and 4 patients received emergency operation. Results In all 70 patients, 52 showed atherosclerotic stenosis disease, 17 atherosclerotic occlusive disease (4 of them were verified by emergency operation) and one patient atherosclerosis with aneurysmal dilatation. A total of 997 vessel segments were shown on MRA images and 600 of them were abnormal including 486(81%) mild to moderate stenoses, 114(19%) severe stenoses and 451 curved arterial segments. In 32 patients who underwent Doppler ultrasound, the diagnosis and its grading based on MRA was well correlated with that from Doppler ultrasound (coincidence rate was 91% and 96% respectively). A total of 764 suprapopliteal and 125 infrapopliteal arteries were depicted by 2D TOF MRA (visibility was 99% and 40% respectively). In 18 patients who received additional 3D CE MRA, totally 306 arteries were depicted on MRA (visibility 100%). Doppler ultrasound showed 40 segments with arterial calcification and 32 atherosclerotic plaques. Conclusions MRA is quite useful in detecting lower extremity arterial disease because of its noninvasion and convenience. The results derived from MRA are well correlated with that of Doppler ultrasound and clinical outcome. 3D MRA is superior to 2D TOF MRA in image quality, accuracy and time efficiency and is best for emergency case. Pitfalls of MRA such as overestimation in the severity of the disease and the long scanning time of 2D TOF must be taken into consideration .
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Objective To evaluate usefulness of high-resolution MRI in quantitative analysis of femoral micro-structure.Methods This study included 110 cases which were divided into 4 groups according to the results of DXA.High-resolution MRI of left hip joint wasperformed on a 1.5T super-conductive MR scanner.3 ROIs were selected on the largest oblique-coronal images of femur to gain thebinary images derived from software processing and 30 parameters were analyzed.Results The parameters to be of statistical significance were 77% and 67%,respectively.Full points of structural parameters with significant difference were 6,4~6 points were 60% and 2~3 points were 40%.Trabecula connective parameters such as trabecula area,mean framework length and mean trabecula perimeter had positive correlation with bone density,r=0.547～0.722,0.58～0.654 and 0.573～0.688,P