Objective To evaluate the value of CT examination in localized diagnosis of primary mesenteric occupancy lesions.Methods CT findings in 35 cases of primary mesenteric occupancy lesions proved operatively and pathologically were analysed.Results Accuracy and postive forecast rate of localization of lesions by CT were 62.9% and 78.6% respectively.The findings of localized diagnosis included:(1)The relation between the occupancy lesions and intestines was closed,the situs was circled by intestines which were fixed and there was no filling defect in 25 cases.(2)The main retroperitoneal organs were distorted and their axes were rotated by the lesions in 15 cases.(3)There was fat space between the lesions and the retroperitoneal organs and the abdomen walls in 11 cases.(4)The main blood vessels of abdomen were compressed by the lesions or the lesions circled by vessels in 9 cases.The localized accuracy was lower when the lesions were larger.Conclusion CT is useful for localization of primary mesenteric occupancy lesions.CT combined with other imaging data and clinical symptoms can improve CT localized accuracy.

Objective To study the CT findings and differential diagnosis of solitary thyroid cystic lesions.Methods 48 cases of solitary thyroid cystic lesions confirmed pathologically were analysed retrospectively.Results According to the CT findings,the lesions could be divided into there types:type Ⅰ simple cyst(n=35),type Ⅱ cyst with nodule on the wall(n=4) and type Ⅲ cyst with thick wall and/or round mass on it(n=9).The enhanced ring appeared in thyroid adenomas was complete(n=25) in comparison with the enhanced ring was fragmentary appeared in thyroid carcinoma(n=2),double circle enhanced ring appeared in abscess(n=2).Type Ⅰ more common appeared in benign lesions(35/35) in comparison with type Ⅱ in malignant lesions(7/9)(P

Objective To investigate MRI characteristics of subacute combined degeneration(SCD)with secondary spinal canal stenosis.Methods The clinical and MRI imaging data of 56 patients with SCD were collected to analyze the performance characteristics between spinal cord lesions and spinal canal stenosis,which depended on the synergism of lumbar disc bluge or herniation,degenerative thickening of the ligament flavum and posterior longitudinal ligament.Results Among 56 SCD cases underwent MRI scan,45 cases were combined with spinal cord lesions which showed typical signs of SCD.37 patients were secondary spinal canal stenosis with typical signs,but 2 showed no typical signs.8 patients were no secondary spinal canal stenosis and showed typical.9 cases showed neither spinal cord lesions nor secondary spinal canal stenosis.There was significant difference (P <0.05)between relative secondary spinal canal stenosis and spinal anomaly signal.The course of 1 5 cases were shortened after treated by physical in 37 cases of SCD with secondary spinal canal. Conclusion The secondary spinal canal stenosis can cause microcirculation dysfunction of the spinal cord,which is a key factor contributing to the imaging manifestation.

Objective To study the diagnostic value of contrast-enhanced CT patterns in focal hepatic lesions.Methods Contrast-enhanced CT patterns in 44 patients with focal hepatic lesions (54 foci) were retrospectively analysed.Results (1)78% of the hepatocellular carcinoma presented "rapid-filling and rapid-washout" feature.(2)All hepatic hemangioma presented "rapid-filling and slow-washout", progressive opacification from the periphery to center. (3)All cholangiocarcinoma presented "slow-filling and slow-washout" .(4)Metastatic hepatocarcinoma in 14 cases and hepatic abscesses in 5 cases were presented a enhanced ring around the lesion, metastatic hepatocarcinomas showed single ring,however, hepatic abscesses showed multi-ring. (5)Focal nodular hyperplasia in 3 cases and hepatic adenomas in 1 case presented "rapid-filling and slow-washout".Conclusion The contrast-enhanced patterns at spiral CT can fully reflect the blood supply of focal hepatic lesions, it has significant value in diagnosing focal hepatic lesions.