Objective To study the imagiological features of subtypes of osteosarcoma,and to improve the knowledge of these tumors.Methods X-ray findings of four subtypes of osteosarcoma in 8 cases proved clinically and pathologically were analysed retrospectively with review of literatare.Results 3 telangiectatic osteosarcomas localized in the upper end of femoral,the lower end of femoral and the lower end of humerus respectively,the fingings of X-ray were expansive and dissolved osseous destruction with soft tissue mass,aneurymal bone cyst-like in one case.3 parosteal osteosarcomas localized in the scapula,middler and lower end of femoral respectively,X-ray fingings appeared as condensans mass projected in soft tissue with radiolucent zone between cortiex of bone.One periosteal osteosarcoma localized in the lower end of femoral,CT showed osseous slight destruction with soft tissue mass.1 intrasseous well-differentiated osteosarcoma localized in the lower end of humerus,X-ray fingings included cystoid destruction,expansion in medullary cavity of bone and thin corter of bone.Conclusion Four subypes of osteosarcoma have ditinct roentgenographic features respectively,which is helpful for diagnosis.

Objective To investigate the characteristic clincal and X-ray findings of mycetoma and to enhance the undestanding of mycetoma. Methods The clinical and X-ray findings of mycetoma in 18 cases were analyzed with the review of literatures. There were 11 males and 7 females, the age ranged from 21-65 years, with the average of 41.5 year. The cases were all peasants, barefoot and with the history of trauma, which lasted for 4-17 years with the aveage of 9.8 year. Results Sixty-seven lesions of bone in 18 cases (30 metatarsal, 20 cuneiform, 7 cuboid, 5 phalanx, 3 tibia, 2 calcaneu) were presented, including 8 rodent, 3 osteolytic, 3 cystic, 2 rodent and sclerosis changes, 2 sclerosis, 9 irregular thickened bony cortex, 7 irregular deleted bony cortex, 12 periosteal reaction, 3 irregular crest of bone in lesion, 13 rarefaction of bone cortex, 11 swimmy of surface arthroses, 8 constriction of interval arthroses, 2 spot calcification in the soft tissue, 2 sequestrum, and 2 soft tissue mass. The mycelium had been discovered in grain in 18 cases and the colour of grain was from brown to black. Conclusion Mycetoma involves extensively and tends to involve multiple bones. The main X-ray findings are rodent and osteolytic changes.

Objective To investigate the clinical and X-ray characteristic findings of the cystic and expansive bone metastasis.Methods The clinical and X-ray findings of the cystic and expansive bone metastasis in 35 cases were analysed with the literaturereviewed.There were 21 males and 14 females,the age ranged from 35 to 70 years with average of 52 years.Results The bone metastasis was found 1~10 years after primary tumor diagnosed in 29 cases befor primary tumor diagnosed in 5 cases and the primary tumor did not know in one case.The primary neoplasmes included nasopharyngeal carcinoma in 10,lung carcinoma in 9,renal carcinoma in 5,breastcarcinoma in 4,thyroid carcinoma in 3,hepatic carcinoma,prostatic carcinoma,esophageal carcinoma and primary focus unknown in onerespectively.The metastatic lesions localized in the long bone in 20 cases,ribs in 4,pelvis in 4,vertebrae body in 2,scopula in 2,clavicle,metacarpal and skull in one respectively.There were 16 cystic destruction,9 expansive destruction,10 both cystic and expansive.The marginated lesions were in 27 and 8 unclear in outline of lesion was in 8.There were distruction in the bony cortex with soft tissue in 7,and sclerosis in outline of lesion in 11 and bone crest and spot clacification inside the lesions in 6.Conclusion The time of metastases occured of cystic and expansive bone metastases is depended on the differentiating degree of primary tumor cell its developmental speed.

Objective To study the CT appearances of solitary fibrous tumors of pleura,in order to improve the knowledge of this diseases.Methods CT findings of solitary fibrous tumors of the pleura proved by pathology in 6 cases were retrospectively analysed with literatures review.Results 6 cases of solitary fibrous tumors of the pleura were all seen in the right thoracic cavity.The tumor was about 3 cm in maximum diameter in one case,and the other 5 cases,the tumors were over 9 cm in maximum diameter.On plain CT scans,all tumors were smooth at edge and with wide base connected to the pleura,the density of tumors were homogeneous in 4 cases,the CT values were 28~39 HU,in the other 2 cases,the tumors were unhomogeneous slightly with low density inside the tumors,CT value of the tumors were 12~40 HU.On contrast-enhanced CT scans in 4 cases,3 tumors showed moderated enhancement and distort vessels could be seen,the CT value were 44~52 HU,the lesions enhanced increasing 12 HU,1 case was obviously unhomogeneous enhancement,the lesions enhanced increasing 22~50 HU and "Pseudo-capsules" were demonstrated in 3 cases.Conclusion Solitary fibrous tumors of the pleura has certain CT characteristics.

Objective To analyse CT features of cystic expansile lesions of the jaw.Methods CT features of 23 cystic expansile lesions of the jaw in 22 patients were retrospectively studied,the configuration and structure of the lesions were observed.Results There were ondontogenic cysts(n=11)including radicular cyst(n=3),dentigerous cyst(n=4)and keratotic cyst(n=5),ameloblastomas(n=6),ondontogenic adenomatoid tumor(n=1),cemento-ossifying fibroma(n=2)and firbrous dysplasia(n=2).The ondontogenic cysts were mainly unilocular in shape with distinct sclerosing margin,most of them contained teeth.Ameloblastomas mainly appeared as multilocular or lobulated in shape and markedly expanded growth with disruption of the adjacent cortex;cemento-ossifying fibroma and fibrous dysplasia were mainly solid tumors,ossifying fibromas often associated with calcification.Conclusion Plain CT scan is of important value in diagnosing cystic expansile lesions of the jaw preoperatively.

Objective To study the CT features of the sero-hepatic type of hepatic tuberculosis.Methods This is a retrospective,multi-center and cross-sectional study.17 patients with the sero-hepatic type of hepatic tuberculosis from the Yueqing People' s Hospital (n =5),Second Affiliated Hospital of Wenzhou Medical College (n =5),and Wenzhou People's Hospital (n =7) were studied.All these patients were fasted for 8 h prior to CT scanning.They underwent enhanced after conventional CT breathless scanning with no abdominal pressure.Results The CT scans displayed 41 lesions in these 17 patients with the sero-hepatic type of hepatic tuberculosis,including a solitary lesion in 13 patients and multiple lesions in 4 patients.The diameter of the lesions varied from 0.8 to 4.7 cm,with a mean ± S.D.of 2.38 ± 4.82 cm.The CT features showed a localized spindle-shaped focal lesion just underneath the liver capsule with resultant concave compression of the adjacent liver tissue (n =22),spotted calcifications in the center of the focal nodules (n =1);and aggregation of multiple low density nodular foci (n =19).Additional CT features included focal nodules surrounded by a small amount of liquid (n =15),compression of adjacent liver tissue (n =22),a small amount of ascites (n =8),and retroperitoneal lymph nodes enlargement (n =2).These nodules showed moderate (n =5) and slight enhancement in the arterial phase (n =36);moderate (n =32) and mild enhancement in the portal venous phase (n =9);and moderate (n =32) and mild enhancement in the parenchymal phase (n =9),respectively.The nodules showed ring-shaped (n =26),honeycomb or multiple ring-shaped enhancement (n =15).The enhanced ring-shaped wall thickness varied from 0.2 to 0.9 cm,with a thin wall (n =30) and a thick wall (n =11).The center of the focal nodule was a low density sac-shaped area,with no obvious contrast enhancement.The CT value was 21 to 39 hu.The infiltrative liver tissues which surrounded the focal nodules were shown as lamellar areas of obvious arterial enhancement,with equidensity in the portal vein phase and equilibrium phase.Conclusions CT showed characteristic features of the sero-hepatic type of hepatic tuberculosis.Clinical and laboratory findings could provide important supplementary information to make the diagnosis.

Objective To investigate the features and diagnostic value of MRI in prenatal and postpartum for placenta accreta. Methods 18 cases of placenta accreta confirmed by surgical pathologically and clinical were retrospectively analyzed,including 10 ca-ses of prenatal and postpartum 8 cases,observed the signal feature and diagnostic value of MRI images.Results In the 10 cases of prenatal patients with placenta accreta,MRI manifestations of 9 cases of placenta prevail,totally or partly covering cervical,10 cases of partial placenta and uterine muscle gap disappeared,boundaries are not clear,2 cases of uterine wall bars low signal-image inter-rupted,bulging outward placenta,increased sub placental vascular wag detected in 8 patients;8 cases of postpartum patients with pla-centa accrete,MRI show 4 examples which were mixed signals within the uterine cavity,with the junctional zone boundaries were not clear,the junctional zone was discontinuous interruption in 7 cases,8 cases of muscular layer appear oval,high and low,patchy mixed signals in shadow,4 cases in the palace district,5 cases of invading the shallow layer,3 cases of infection and deep muscle layers. Conclusion MRI technique is of great value for diagnosis of placenta accreta.

Objective To investigate the characteristics and diagnostic value of multislice spiral CT (MSCT) of intestinal lipomas causing intussusception.Methods The MSCT findings of 25 cases with intestinal lipomas causing intussusception were retrospectively analyzed,the tumor location,size,shape,density,enhancement patterns and shape and length of intussusception were also observed retrospectively.Results Tumors were 1.2-6.5 cm in diameter,round or oval in shape (n =18),irregular shape (n =4),tubular shape (n =3) with uniform density (n =19),or uneven density (n =6).Under CT enhancement tumor capsule was moderately intensified.Intussusception included ileum-ileum type (n =7),jejunum-jejunum type (n =5),jejunum-ileum type (n =2),ileum-colon type (n =4),and colon-colon type (n =7).Intussusception was 5.0-5l.0 cm in length;presenting as concentric circles (n =12),round target sign (n =7),orbanana (n =6).Conclusion Intestinal liporna complicating secondary intussusception has definite MSCT characteristics which can help establish diagnosis.

Objective To investigate radiological features on computed tomography (CT) in the di agnosis of portal venous and intestinal wall gas in patients with ischemic bowel disease.Methods The clinic-pathological data of 17 patients with portal venous and intestinal gas associated with ischemic bowel diseases from Wenzhou People's Hospital (n =6),Yueqing People's Hospital (n =5),Shanghai Xuhui Dahua Hospital (n =3) and the Second Affiliated Hospital of Wenzhou Medical University (n =3) from January 2013 to October 2016 were analysed retrospectively.All the patients have been fasting for 8 h prior to CT scans.Enhanced CT study was performed following routine CT with no abdominal pressure for breath less scanting.Portal venous gas,intestinal wall gas,intestinal thickness and density,mesentery thickness,celiac effusion,and severity of intestinal wall enhancement were recorded.Results All the 17 patients ex perienced abdominal distension and pain.Additionally,nausea and vomiting was observed in 9 patients,di arrhea in 7,melena in 7,periumbilical tenderness in 11 and rebound tenderness in 8.CT scans of these 17 patients showed portal venous gas,including massiveprune-tree signs of hepatic vein and portal vein (n =11) and scanty gas shadows in distal hepatic vein (n =6).Intestinal gas sign was determined in all these patients (n =17),including single bubble shadow (n =8),multiple bubble shadow (n =7),and band-shaped bubble (n =2).Furthermore,CT study indicated extensive intestinal wall thickening with edema (n =13),predominate luminal extension of thinner bowels (n =4),scanty celiac effusion (n =3).Enhanced CT scans demonstrated 8 patients with decreased enhancement of intestinal wall and mesentery with diseases,target and halo signs observed in enhanced scans.Conclusions Portal venous and intestinal wall gas may demonstrate distinctive CT imaging.CT study could have superior sensitivity and spe cialty in clinical diagnoses of ischemic bowel diseases.

Objective To explore the value of MRI in differentiation diagnosis of benign ovarian mucin-ous cystadenoma ( MC) and borderline mucous cystadenoma ( BMC).Methods MRI data of 23 cases of benign MC and 14 cases of BMC, confirmed by surgery and pathology, were retrospectively analyzed, including tumor lo-cation, shape, size, loculation, signal intensity of cyst fluid, cyst wall, cyst septum and nodules, and they were compared with pathological results.Results Single loculus benign cystadenoma nodules showed isointensity T2 WI signal, low T1 WI signal, and low DWI signal.Single loculus borderline cystadenoma nodules showed high T2 WI signal, low T1 WI signal, and high DWI signal.Signs such as honeycomb loculi of multilocular cystadeno-ma, cyst fluid of high T1 WI signal, cyst fluid of low T2 W1 signal, cyst wall and irregularly thickened cyst septum ( >3 mm) were more seen in BMC (7/11, 6/11 and 7/11) than in MC (5/18, 4/18 and 5/18);5 cases were with cyst sediments (MC=4, BMC=1), showing moderate T2WI signals, and high T1WI signals.Broken fish-ing net gathering was only restricted to MC (5/18) with characteristics.Benign multilocular cystadenoma nodules showed low DWI signal,and borderline multilocular cystadenoma nodules showed high DWI signal.Conclusion MRI can well display pathological characteristics of ovarian MC, which has practical value for the differentiation and diagnosis of MC and BMC and can provide the reference for clinical surgery.