Computer tomographic differential diagnosis of ameloblastoma and odontogenic keratocyst: classification using a convolutional neural network.

OBJECTIVE: To analyse the automatic classification performance of a convolutional neural network (CNN), Google Inception v3, using tomographic images of odontogenic keratocysts (OKCs) and ameloblastomas (AMs). METHODS: For construction of the database, we selected axial multidetector CT images from patients with confirmed AM (n = 22) and OKC (n = 18) based on a conclusive histopathological report. The images (n = 350) were segmented manually and data augmentation algorithms were applied, totalling 2500 images. The k-fold × five cross-validation method (k = 2) was used to estimate the accuracy of the CNN model. RESULTS: The accuracy and standard deviation (%) of cross-validation for the five iterations performed were 90.16 ± 0.95, 91.37 ± 0.57, 91.62 ± 0.19, 92.48 ± 0.16 and 91.21 ± 0.87, respectively. A higher error rate was observed for the classification of AM images. CONCLUSION: This study demonstrated a high classification accuracy of Google Inception v3 for tomographic images of OKCs and AMs. However, AMs images presented the higher error rate.

[Prediction of Pathological Subtypes of Lung Adenocarcinoma with Pure Ground Glass Nodules by Deep Learning Model].

Objective To make a preliminary pathological classification of lung adenocarcinoma with pure ground glass nodules(pGGN)on CT by using a deep learning model. Methods CT images and pathological data of 219 patients(240 lesions in total)with pGGN on CT and pathologically confirmed adenocarcinoma were collected.According to pathological subtypes,the lesions were divided into non-invasive lung adenocarcinoma group(which included atypical adenomatous hyperplasia and adenocarcinoma in situ and micro-invasive adenocarcinoma)and invasive lung adenocarcinoma group.First,the lesions were outlined and labeled by two young radiologists,and then the labeled data were randomly divided into two datasets:the training set(80%)and the test set(20%).The prediction Results of deep learning were compared with those of two experienced radiologists by using the test dataset. Results The deep learning model achieved high performance in predicting the pathological types(non-invasive and invasive)of pGGN lung adenocarcinoma.The accuracy rate in pGGN diagnosis was 0.8330(95% CI=0.7016-0.9157)for of deep learning model,0.5000(95% CI=0.3639-0.6361)for expert 1,0.5625(95% CI=0.4227-0.6931)for expert 2,and 0.5417(95% CI=0.4029-0.6743)for both two experts.Thus,the accuracy of the deep learning model was significantly higher than those of the experienced radiologists(P=0.002).The intra-observer agreements were good(Kappa values:0.939 and 0.799,respectively).The inter-observer agreement was general(Kappa value:0.667)(P=0.000). Conclusion The deep learning model showed better performance in predicting the pathological types of pGGN lung adenocarcinoma compared with experienced radiologists.

Prediction of Pathological Subtypes of Lung Adenocarcinoma with Pure Ground Glass Nodules by Deep Learning Model / 中国医学科学院学报

To make a preliminary pathological classification of lung adenocarcinoma with pure ground glass nodules(pGGN)on CT by using a deep learning model. CT images and pathological data of 219 patients(240 lesions in total)with pGGN on CT and pathologically confirmed adenocarcinoma were collected.According to pathological subtypes,the lesions were divided into non-invasive lung adenocarcinoma group(which included atypical adenomatous hyperplasia and adenocarcinoma in situ and micro-invasive adenocarcinoma)and invasive lung adenocarcinoma group.First,the lesions were outlined and labeled by two young radiologists,and then the labeled data were randomly divided into two datasets:the training set(80%)and the test set(20%).The prediction Results of deep learning were compared with those of two experienced radiologists by using the test dataset. The deep learning model achieved high performance in predicting the pathological types(non-invasive and invasive)of pGGN lung adenocarcinoma.The accuracy rate in pGGN diagnosis was 0.8330(95% =0.7016-0.9157)for of deep learning model,0.5000(95% =0.3639-0.6361)for expert 1,0.5625(95% =0.4227-0.6931)for expert 2,and 0.5417(95% =0.4029-0.6743)for both two experts.Thus,the accuracy of the deep learning model was significantly higher than those of the experienced radiologists(=0.002).The intra-observer agreements were good(Kappa values:0.939 and 0.799,respectively).The inter-observer agreement was general(Kappa value:0.667)(=0.000). The deep learning model showed better performance in predicting the pathological types of pGGN lung adenocarcinoma compared with experienced radiologists.

Multi-slice CT imaging features of pancreatic neuroendocrine carcinoma / 中国医师进修杂志

Objective To investigate the multi-slice CT (MSCT) imaging features of pancreatic neuroendocrine carcinoma (PNEC). Methods A retrospective analysis of the MSCT and pathological findings of 10 PNEC patients confirmed by surgery and pathology was performed. Results Among the 10 patients, the tumor locating at pancreatic head was in 1 case, at pancreatic body was in 1 case, and at pancreatic tail was in 8 cases. The maximum diameter was 1.8-8.5 (4.7 ± 3.6) cm. The boundary between mass and normal pancreas was unclear, among which there was a circle-like shape in 4 cases, and irregular shape in 6 cases. The plain scan showed that there were cystic changes in the mass, including cystic lesion locating in the center of the lesion in 7 cases, and that locatingd in the periphery of the lesion in 3 cases. The plain CT value was (36.0 ± 8.3) HU. The enhancement scan showed that the circumference was mainly ring enhancement, the arterial phase CT values was (78.0 ± 6.7) HU, the portal venous phase CT values was (83.0 ± 8.2) HU, and the balanced phase CT values was (69.0 ± 9.1) HU. Under the microscope, found that the tumor were made up of small cells and large cells, the tumor tissue was invasive. The atypia of tumor cells was obvious, diffuse and distribution was diffuse, with necrosis. The nuclear division was more common. The immunohistochemical result showed that synaptophysin (Syn) positive was in 10 cases, neuron-specific enolase (NSE) positive was in 7 cases, chromogranin A (CgA) positive was in 7 cases, and CD56 positive was in 6 cases; the percentage of Ki-67 expression positive cell < 3% was in 3 cases, 3%-20% was in 4 cases, and ＞20% was in 3 cases. Conclusions The MSCT imaging findings of PNEC has certain characteristics, and multi-period dynamic contrast-enhanced scan is helpful for the diagnosis of pancreatic neuroendocrine carcinoma.

Diagnosis and treatment of nine elderly patients with incarcerated extracorporeal hernia combined with colorectal cancer / 中国医师进修杂志

Objective To investigate the clinical features, diagnosis and treatment of colorectal cancer in patients with incarcerated extracorporeal hernia. Methods The clinical manifestations, diagnosis and treatment of 9 cases of incarcerated hernias combined with colorectal cancer from January 2012 to December 2017 were retrospectively analyzed. Results All the patients were treated with surgery. Three cases underwent Hartmann surgery and incarcerated release, high ligation of hernia sac; 2 cases underwent tumor resection and tension-free hernia repair; 1 case underwent necrotic bowel resection, tumor resection and ileal stoma and tension-free hernia repair; 1 case underwent transverse colostomy and incarcerated release, high cyst ligation; 1 case underwent tension-free hernia repair and limited colon cancer radical resection; 1 case underwent high ligation of the hernia sac and limited tumor resection. Intraoperative and postoperative pathology confirmed that this group was all incarcerated abdominal hernia combined with colorectal cancer. There were 4 patients misdiagnosed before surgery. Conclusions The diagnosis and treatment often ignore the presence of colorectal cancer due to the typical clinical manifestations of incarcerated abdominal hernia. The preoperative misdiagnosis rate is high. Completing CT scans before surgery can help clarify the diagnosis and select a reasonable surgical approach.

Diagnostic value and characteristics of CT enterography in primary intestinal T-cell lymphoma / 中国医学影像技术

Objective To evaluate the manifestations and diagnostic value of CT enterography (CTE) in primary intestinal T-cell lymphoma (PITCL).Methods Eighteen patients with PITCL confirmed by pathology were reviewed retrospec tively.The characteristics of lesion site,amount of foci,pattern and degree of contrast enhancement,lymphadenopathy,involvement of other organs and complications were recorded.Results In all of the 18 patients with PITCL,multiple lesions were seen in 13 cases (13/18,72.22％),and solitary involvement was seen in 5 cases (5/18,27.78％).Twelve ca ses were located at jejunum/ileum,3 of them were also involved in the colon.Five cases were located only in the colon,and 1 in the duodenum.Six cases were complicated with intestinal perforation.The patients were categorized into 6 types according to the CT manifestation:infiltration type (n=7),diffuse jejunum mucosa ileum metaplasia type (n =3),luminal aneurismal dilatation type (n =3),polypoid mass type (n =2),mesentery type (n=1),mixed type (n =2).Conclusion CTE can clearly display the imaging of PITCL and it has high value for the diagnosis of PITCL.

Clinical value of DR and CT in the secondary pulmonary tuberculosis / 中国基层医药

Objective To discuss different performance of DR and CT examination on secondary pulmonary tuberculosis,to improve the clinical guidance value of CT in the diagnosis of secondary pulmonary tuberculosis. Methods The image data of 52 cases with secondary pulmonary tuberculosis confirmed by pathology were collected, including chest DR radiography and CT scans.The different image characteristics of two kinds of imaging examination were analyzed and compared.Results In 52 cases of secondary pulmonary tuberculosis,chest X -ray plain film found lesions calcification in 3 cases,2 cases of bronchiectasis,pleural thickening and adhesion in 12 cases,pleural effusion in 1 case,empty cavity in 4 cases,emphysema in 1 case,the lung nodules in 5 cases.Chest CT revealed lesions calcification in 9 cases,16 cases of bronchiectasis,pleural thickening and adhesion in 40 cases,pleural effu-sion in 4 cases,empty cavity in 10 cases,emphysema in 8 cases,the lung nodules in 10 cases,6 cases of pulmonary bullae,pulmonary interstitial change:4 cases of lung reticulocyte shadows,interlobular septal thickening in 4 cases, ground glass sample density in 4 cases.Conclusion DR and CT can be used for inspection of secondary pulmonary tuberculosis,but CT is a better tool,it has important guiding role for clinical diagnosis and treatment.

Primary exploration of energy spectral CT water -based material decomposition technology for the detection of bone marrow edema in sacroiliitis / 中国基层医药

Objective To explore the value of water -based material decomposition images for detection of bone marrow edema (BME)in sacroiliitis with energy spectral CT.Methods The sacroiliac (SI)joints of nine spondyloarthropathy patients with sacroiliitis (the research group)and eight healthy volunteers (the control group) were underwent MRI and energy spectral CT.The mixed energy image of energy spectral CT was reconstructed to be mono energy image.Then,the mono image was divided into water -based image and calcium image by material divid-ed and analyzed software.The SI para -articular marrow region water -calcium relative concentration of research group was compared with that of control group.The BME diagnosis efficiency and optimal water -based concentration of energy spectral CT was analyzed by receiver operating characteristic (ROC)curve.Then,the sensitivity,specificity, positive likelihood ratio and negative likelihood ration were calculated.Results The water -based concentration of BME in research group (1 067.43 ±10.84)g/L was higher than that of control group (1 039.43 ±8.01)g/L(t =-3.14,P =0.003).Meanwhile,the calcium -based concentration of research group (68.98 ±20.53)g/L was not different from control group (78.03 ±26.39)g/L(t =1.88,P =0.066).ROC curve showed that the diagnosis efficiency was medium as the area of under curve was 0.75.When the optimal concentration of water -based was 1 052.00g/L,the diagnosis efficiency was the best.The sensitivity and specificity was 84.00%,62.50% respectively. Conclusion There are reference value and potential clinical value with energy spectral CT water -based concentra-tion detection for diagnosis BME in patients with sacroiliitis.

Application of low dose CT colonography combined with enhanced scan in the diagnosis of colorectal neoplasms / 中国基层医药

Objective To investigate the clinical value of low dose CT colonography (CTC)combined application of enhanced scanning in the diagnosis of colorectal neoplasms,thus to provide a reference for clinical treatment.Methods 64 patients with suspected colorectal cancer were studied retrospectively,they were divided into two groups according to the diagnostic methods.The observation group(21cases)underwent low -dose CTC joint enhanced scan,the control group(43 cases)were taken usual routine dose CTC joint enhanced scan.The scanning image quality and radiation dose of two groups were compared.Took colonoscopy or pathological examination as diagnostic standard,the accuracy of two groups was compared.Results The excellent image rate of the observation group was 95.24%,which was lower than that of the control group,but the difference between the two groups was not statistically significant(χ2 =0.947,P =0.217).The radiation doses of the observation group were (1024.48 ± 98.64)mGy/cm,(15.37 ±1.48)mSv,which were significantly lower than those of the control group[(1411.28 ± 159.57)mGy/cm and (21.17 ±2.39)mSv],the differences were statistically significant (t =15.447,P =0.000;t =15.447,P =0.000).The diagnostic sensitivity,specificity,positive rate,negative rate of the observation group were 100.00%,85.71%,93.33%,100.00%,there were no statistically significant differences compared with the control group (χ2 =0.000,1.014,0.957 and 0.000,P =1.000,0.098,0.211 and 1.000).Youden index of the observation group and the control group were 0.86 and 0.92.Conclusion CTC combined with low -dose enhanced CT diagnosis for colorectal cancer has similar accuracy with conventional dose,and patients will take less radiation dose,it is worthy of clinical application.

Application value of total abdominal CT examination in elderly patients with acute intestinal obstruction / 中国基层医药

Objective To explore the necessities and clinical value of acute intestinal obstruction with com-puted tomography of whole abdomen in over 80 years old patients.Methods 50 patients with acute intestinal obstruc-tion were diagnosed in department of emergency surgery and underwent the abdominal CT examinations.The clinical data,CT and surgery pathology of all patients were compared and analyzed.Results All cases were verified by surgi-cal operation and pathological diagnosis,including colorectal cancer(n =21)and incarcerated abdominal external her-nia(n =21),appendicitis(n =2),adhesive intestinal obstruction(n =2),intestinal volvulus (n =2),and intestinal intussusception(n =1)and stercoral intestinal obstruction(n =1),12 cases were accompanied by bowel necrosis and perforation.12 patients were treated by laparoscope surgery,38 cases by open laparotomy,48 patients acquired good recovery,and 2 cases died from extensive bowel necrosis and multi -organ failure.Conclusion CT examination in whole abdomen could rapidly and accurately diagnose the cause of intestinal obstruction,evaluate complications and risks,so as to provide reasonable treatment choice and time,making patients acquired the effective effects as soon as possible,reducing the bad consequences.

Feasibility of model-based iterative reconstruction in 80 kV low-radiation chest CT in children / 中国医学影像技术

Objective To evaluate the feasibility of model-based iterative reconstruction (MBIR) in low-dose chest CT (80 kV) examination in children.Methods Forty-four children who had post-operation scoliosis and received low dose chest CT scans were included.The fix tube voltage was 80 kV,fix current was 50 mA.Images were reconstructed with MBIR (observation group).The pre-operation scan were used 120 kV and 50 mA for acquisition,and images were reconstructed with filtered back-projection (FBP) mehed (control group).The subjective quality of the images was independently evaluated by two radiologists.Objective noises in the muscle and lung field were measured,the SNR,CNR were calculated,and the CTDIvol was record.Results The subjective noise score in the observation group was significantly higher than that in the control group (P＜0.05).Objective noise reduced about 40.36％,SNR increased 72.37％,CNR increased 78.69％,CTDIvol decreased by 66.52％,all of which had statistical difference between both groups (all P＜0.001).Conclusion Low-dose chest CT (80 kV) examination in children can meet the requirements of diagnosis for children.

Wide-detector Revolution CT with 70 kV tube voltage and prospective ECG-gated technique in diagnosis of congenital heart disease in infants and children / 中国医学影像技术

Objective To investigate the value of wide-detector Revolution CTA with 70 kV tube voltage and prospective ECG-gated technique in diagnosis of congenital heart disease (CHD) in infants and children.Methods Forty-five infants and children with complicated CHD underwent echocardiography and wide-detector Revolution CTA.According to the sur gical findings,the diagnostic efficiency of Revolution CTA and echocardiography were calculated and compared.The radiation effective dose (ED) and iodine dose were calculated.The quality of CT images was also evaluated.Results There were 25 separate cardiovascular anomalies including 6 congenital cardiac structure anomalies and 19 congenital extracardiac vascular anomalies.For congenital extracardiac vascular anomalies,there was significant difference of diagnostic accuracy and the detectable rate between CTA (99.77％ [853/855],97.73％ [86/88]) and echocardiography (98.71％ [844/855],88.64％ [78/88];x2 =6.28,5.72,both P＜0.05).The average of ED was (0.20±0.05)mSv and the mean iodine dose was (2.06± 1.09)g.All CT images were qualified for diagnosis.Conclusion The wide-detector Revolution CTA,with the prospective ECG-gated technique and 70 kV tube voltage,can provide high accuracy for assessment of CHD in infants and children,which can keep good image quality,with the low radiation dose.

The value of single-source spectrum CT in differentiating of calcification and tophus / 中国基层医药

Objective To evaluate the advantage of single -source spectrum CT in differentiating of calcifi-cation and tophus.Methods 146 cases of clinical suspected patients with gout pain were scaned by single -source spectrum CT,observed the adjacent to the bone and joint hyperplasia and showing characteristics of gout stone,coun-ted quantity,size and position of the sedimentary tophus.Diagnosed by American rheumatism association standard as the gold standard,computed the sensitivity,specific degrees and accuracy of showing tophus of single -source spec-trum CT and conventional CT,and evaluated the advantage of differentiating adjacent to the bone and joint hyperplasia and gout stone of single -source spectrum CT.Results Diagnosis of gout in 105 cases.Scaned 349 joints,positive in 341 of them,The first plantar toe joint involvement was obvious[118,34.60%(118/341)];The result showed that the sensitivities of the tophus,specific and accurate rate of the conventional CT were 63.80%(67 /105),65.85%(27 /41),64.38%(94 /146),which of single -source spectrum CT were 96.19%(101 /105),87.80%(36 /41), 93.84%(137/146),the differences of sensitivity,specificity and accuracy between the two methods were statistical significance(χ2 =34.42,555,38.34,all P <0.05).Conclusion Single -source spectrum CT in gout stone adjacent to the bone and joint has higher sensitivity and accuracy,specific degree,it is higher than conventional CT and provide a new noninvasive imaging technique for the identification of the peripheral bone and joint of the bone.

Application of low dose CT lung cancer screening in the detection of micro invasive pulmonary adenocarcinoma / 中国基层医药

Objective To research the performance of micro infiltration type lung adenocarcinoma (MIA) in the low -dose CT (LDCT).Methods The clinical data of 34 patients with lung adenocarcinoma who found by LDCT screening and diagnosed as micro infiltration were retrospectively analyzed, LDCT performance of lesions was observed.Results In 34 patients,32 cases of single grinding glass tubers,2 cases of multiple ground glass nodules (2 and above),a total of 36 nodules.With pure glass grinding nodule in 11 (30.5%),mixed grinding glass nodules 25 (69.5%).Lesions was 0.7 -2.4cm in diameter,the diameter was about 1.0 -2.0cm,a total of 27(75.0%),an average of (1.7 ±0.3) cm.5(13.8%) of left upper lobe,left lung lobe 9(25.0%),6(16.6%) of the upper lobe, right lung middle in 8(22.2%),characterized by lower lobe in 8(22.2%).Radiographic signs included air -20 cases (55.6%),fine bronchiectasis sign clear edge in 22(61.1%),Ye Zheng a total of 29(80.6%),including deep lobe 9(25.0%),shallow lobes 20(55.6%),burr 17(47.2%),pleural indentation 20(55.6%).Bronchus truncation 6(16.7%),vascular cluster 9(25.0%).Conclusion Found in LDCT screening between 1.0 -2.0cm in diameter of grinding glass nodules,especially the grinding glass nodules,quantitative classification is higher at the same time, lesion boundaries clear,or points Ye Zheng,burr,air -with fine bronchiectasis and pleural indentation,micro infiltra-tion is characteristic and highly suggestive of lung adenocarcinoma.

The diagnostic value of cavernous transformation of the portal vein with multi-slice CT / 中国基层医药

Objective To investigate the multi -slice CT angiography(MSCTA)findings and explore the clinical value of cavernous transformation of the portal vein(CTPV).Methods CT and clinical materials of 29 cases CTPV were retrospectively analyzed.Results Portal vein obstruction and surrounding fine dialated portoportal collat-erals were found in all 29 cases,Gastroesophageal varices and abnormal hepatic perfusion signs were detected in 25 patients and 8 cases respectively.Pericholedochal venous plexus and cystic vein were dilated and varicose in 9 cases. Conclusion Multi -slice CT has an important clinical role in CTPV diagnosis and treatment,and it can be used to evaluate the the portal vein obstructed status,the collateral vessels,and the accompanied complications of CTPV.

Clinical value of CT in evaluation of anti -tuberculosis chemotherapy in elderly patients with active tuberculosis / 中国基层医药

Objective To explore the activity signs and clinical value of CT in evaluation of anti -tuberculosis chemotherapy in elderly patients with active tuberculosis.Methods Clinical and imaging data of 78 cases with elderly active tuberculosis were retrospectively analyzed.The changes of CT sign between bacterium negative and posi-tive,before and after chemotherapy were compared.Results The detection rates of ground glass opacity,thick -walled cavity in bacterium positive were 72.1% and 55.8%,which were significantly higher than those in bacterium negative 45.7% and 28.6%(P <0.05).Compared with before chemotherapy,the detection rates of ground glass opacity,tree -in -bud,thick -walled cavity,pulmonary consolidation,centrilobular nodule,lobular consolidation after chemotherapy were significantly reduced(P <0.05).The active CT signs of ground glass opacity,tree -in -bud were completely absorbed,and other signs were lapsed to non -active signs including cord -like shadow,thin -walled cav-ity,calcification,bronchia aggregation and circuity.Conclusion There is conversion rule of CT signs in elderly active pulmonary tuberculosis before and after anti -tuberculosis chemotherapy,and CT is helpful in the evaluation of anti -tuberculosis chemotherapy results of active tuberculosis.

Application of low voltage with CARE dose 4D in the computed tomography pulmonary angiography(CTPA) / 中国基层医药

Objective To assess the feasibility of low voltage with CARE dose 4D computed tomography pul-monary angiography(CTPA)by using image quality and radiation dosage.Methods 92 patients with clinically sus-pected pulmonary embolism(BMI:20 ~30kg/m2)were randomly divided into two groups(group A:n =46,80kV;groups B:n =46,100kV),the male and female of group A were equal to the number.Image quality score(given blind-ly by two senior radiologists ranged from 1 to 5 points).The CT value and standard deviation(SD)were measured and recorded in common pulmonary artery trunk,the main right pulmonary arteries,right low lobar arteries,and erector muscle of spine,calculated the SNR of ROI.Average CT value,signal noise ratio(SNR),CTDIvol,DLP were com-pared between the two groups.Used the CT dose index(CTDIvol)to compare radiation dosage between group A female and male.Results The agent average CT value and SD in arteries in group A [(510.27 ±115.45)HU,(50.06 ± 11.67)HU respectively]were higher than those in group B[(413.32 ±100.38)HU,(35.12 ±11.94)HU respective-ly],there were significant differences between the two groups(t =10.367,8.892,all P =0.000),but the SNR of ROI was (12.36 ±3.90),which was lower than (14.03 ±4.46)in group B,there was significant difference between the two groups(t =-5.238,P =0.001 ).Image quality score of transverse ection(1mm)in group A was (4.20 ± 0.29),which was lower than (4.91 ±0.36)in group B,there was significant difference(t =-20.23,P =0.000), but there was no significant difference in coronal section(5mm),coronal maximum intensity project(MIP)image and the capability of displaying the pulmonary artery branches(all P >0.05 ).The CTDIvol in group A was (2.03 ± 0.39)mGy,which was greatly lower than (5.04 ±1.02)mGy in group B,there was significant difference (P 0.05].Conclusion Radiation dose can be decreased greatly(above 50%)in 80kV CTPA compared 100kV without compressing obviously the image quality for patients BMI 20 -30kg/m2 ,and no significant difference between the group A(80kV)different gender radiation dosage.

The application effect of CT angiography features on qualitative and differential diagnosis of small nodules in the lung lesions / 中国基层医药

Objective To investigate the effect of CT angiography on the qualitative and differential diagnosis in small pulmonary nodules.Methods 120 patients with pulmonary small nodular lesions from September 2014 to October 2015 in our hospital were selected,and they were divided into the observation group and control group according to pathological type.the patients with malignant pathology were in the observation group,with totaling 64 cases;the patients with benign pathology were selected as a control group,with a total of 56 cases.Lesion type,sensitivity,vascular sign type,CT enhancement value and the ratio of enhancement value to aorta value in the two groups were compared and analyzed after the CT scan.Results In the observation group,positive CT angiography sign was 50 cases while negative ones was 14 cases,the sensitivity was 78.1%;In the control group,CT angiography sign was positive in 16 cases,negative in 40 cases,with the sensitivity of 28.6%.Comparing of two vascular symptoms sensitive case, there was a significant difference(χ2 =6.781,P =0.012).Vascular symptoms genotyping were compared in vascular symptoms positive patients,the results showed significant differences(χ2 =7.694,6.964,5.993,6.012,all P CT angiography features has played a very important role in qualitative and differential diagnosis of small nodular lesions in the lungs.It is of great significance in the clinical diagnosis and treatment,and is worth further promotion.

The imaging findings of CT and MRI in patients with abdominal and pelvic solitary fibrous tumor and its pathological features / 中国基层医药

Objective To investigate the imaging findings of CT and MRI in patients with abdominal and pelvic solitary fibrous tumor and its pathological features.Methods 30 patients with abdominal and pelvic solitary fibrous tumor were chosen.Patients with CT and MRI,and pathologic features control study were analyzed.Results In 30 patients,mesenchymal tumors,malignant fibrous histiocytoma and ovarian fibroma patients were 12 cases,12 cases, 6 cases.CT showed that mass state clearly,smooth contours,the substance of the composition of two different densi-ties,increase significantly enhanced scan,saw a number of tumor blood vessels within the shadow arterial aneurysm. MRI showed that internal tumors were low signal stripes appear.Tumor necrosis internal punctate liquefaction zone, after enhanced scan,the patient did not appear to strengthen.6 patients had resection specimens.4 cases had a more complete capsule,two cases with incomplete capsule.Conclusion SFF has certain characteristics in CT and MRI imaging screening,combined with its pathological features analysis will help improve the diagnosis.