ABSTRACT
Influenza virus , the causative agent of influenza , has characteristics of fast transmission and strong infectivity, posing a major threat to public health .Currently, with widely use of the first-line antiviral neuraminidase inhibitors , drug-resistant strains have appeared and brought difficulties to the precaution and treatment of influenza .This article reviews influenza virus structural characteristics , drug-resistance mechanisms , resistance situation and detection methods of drug-resistant virus strains , aiming to provide a reference for future research on influenza virus drug-resistance and clinical medication .
ABSTRACT
Objective To analyzed imaging features of testicular and epididymal tumors or inflammatory nodes in children and to improve its diagnostic accuracy.Methods 13 cases underwent ultrasonography,of them,plain CT scan in 10 cases,enhanced CT scan in6 cases.Its signs were retrospectively analyzed and compared with surgical and pathological results.Results On ultrasonography,theinhomogenous and different echo could be viewed in 13 cases,color Doppler flow imaging was abundant in 8 masses,3 cases with littler,empty blood flow in 2 cases and retroperitoneal lymphatic metastasis were viewed in 2 cases.On plain CT scan,masses were mixed density in 4 cases,calcification could be seen within tumor in 3 cases,masses were soft tissue or main soft tissue density in 6 cases.Contrast-enhancedCT scan displayed obviously and inhomogenously in 4 cases,lightly enhancment in 1 case and no enhanced in 1 case.By surgical andpathological confirmed,3 were mature treatomaes,1 was immaturity teratoma,4 were yolk sactumor,3 were inflammatory nodes,1 wasrhabdomyosarcoma and 1 was cystic lymphangioma.Conclusion Each kind of testicular tumors in children has its owns CT and UScharacteristics.In combination of CT and US can carry high diagnostic accuracy.
ABSTRACT
Objective To analyze radiographic characteristics of pneumomediastinum in neonates,and to improve its diagnostic quality. Methods Supine anteroposterior chest film was taken in 22 neonates with pneumomediastinum, additional supine lateral chest film with horizontal projection simultaneously carried out in 16. One or more radiographic follow-ups was made in 14 cases. Spiral CT scanning was done in 4 patients. The imaging findings were retrospectively analyzed.Results Of the total 22 cases, thymic spinnaker-sail sign was seen in 9,transparent area cross the intermediate line of mediastinum in 9,streak and cystic transparent area scattered in the mediastinum in 4. Pneumothorax was accompanied in 12 cases.Conclusion Pneumomediastinum in newborn has its own radiographic characteristics. In most patients occurred thymic spinnaker-sail sign,or transparent area cross the intermediate line of mediastinum and frequently with pneumothorax. It is best shown by integrating supine anterioposterior films with lateral films of horizontal projection. CT scanning can provide more valuable information.