Objective To evaluate the diagnosis and treatment of primary retroperitoneal tumor. Methods The clinical data of 75 patients with primary retroperitoneal tumor confirmed by operation and pathology in recent 20 years in our hospital were analyzed retrospectively. Results About 57.3% of the patients were diagnosed accurately before the operation. Correct diagnostic rates of ultrasound and CT were 60.0% and 84.0% ,respectively.Of them 57cases(76.0%) were malignant and18 (24.0%) benign tumor. Tumor size was not related to the pathological characteristics.Radical resection was done in 42 patients(56.0%),partial resection in 23 patients (30.7%),and biopsy in 10 patients(13.3%).Conclusions Ultrasonic and CT are the major diagnostic methods. Early operation is recommended after necessary preparation. Surgical resection is a major procedure for the management of primary retroperitoneal tumor and might provide long surrival time.

It is difficult for traditional parametric active contour (Snake) model to deal with automatic segmentation of weak edge medical image. After analyzing snake and geometric active contour model, a minimum variation snake model was proposed and successfully applied to weak edge medical image segmentation. This proposed model replaces constant force in the balloon snake model by variable force incorporating foreground and background two regions information. It drives curve to evolve with the criterion of the minimum variation of foreground and background two regions. Experiments and results have proved that the proposed model is robust to initial contours placements and can segment weak edge medical image automatically. Besides, the testing for segmentation on the noise medical image filtered by curvature flow filter, which preserves edge features, shows a significant effect.
Diagnostic Imaging ; Humans ; Image Processing, Computer-Assisted ; methods ; Models, Theoretical

Objective To study the management of vascular injury.Methods Retrospective analysis was made on the clinical data of 59 cases of vascular injury,including 55 cases of vascular injury in neck and(extremity) and 4 cases of portal vein and vena cava injury.Among them,21 cases had femoral artery injury with infection and 4 cases had vascular injury due to intervention therapy.All patients with vascular wound of extremity or neck had undergone hemostasis by compression and antishock treament before hospital admission.All cases of femoral artery injury with infection underwent hemostasis by arterial ligation and incision and(drainage) of abscess.Vascular anastomosis was performed in 11 cases,vascular grafting in 12 cases,and(vascular) repair in 14 cases.Results There were 2 deaths.5 cases had amputation(including a case of(femoral) embolism due to intervention trerapy).Postoperative intermittent claudication,decreased skin(temperature) and other signs of ischemia occurred in 21 cases of femoral artery injury with infection,but none developed limb gangrene. The other cases were discharged in good health.Conclusions In the treatment of vascular injury,wound hemostasis and antishock treatment should be done first to save the patient′s life and the management of the vascular injury depends on the situation,with the aim to try by all means to save the extremity.Vascular reconstruction is the main method for treatment of vassular injury.Vascular ligation can be done in cases of femoral artery injury with infection.

Objective To summarize the experience in the diagnosis and treatment of hepatic trauma. Methods The clinical data of 260 patients with hepatic trauma admitted from January 1988 to December 2007 were retrospectively reviewed with regard to degree of trauma, treatment methods, therapeutical effects, complications and SO on. Results One hundred and fifty-three eases were treated by operative management,1 07 cases by nonoperative management.236 cases were cured,24 cases died,and the case fatality rate was 10.2%.There were no death among 139 patients with hepatic trauma grades Ⅰ～Ⅱ,22 death among 119 grades Ⅲ～Ⅴ patients, all death of 2 in grade VI, which demonstrated the correlation between death and hepatic trauma grade was statistically significant. Complications appeared in 82 eases, mainly including Secondary hemorrhage, abdominal infection and so on. Conclusions Nonoperative management is suitable for hepatic trauma with stable hemodynamics. Operative management is rapidly selected when the hemodynamics aren't stable. The cooperation of many specialities can enlarge the application of nonoperative management and decrease complications.