Renal pseudotumors: CT diagnosis and differential diagnosis / 医学研究生学报

Objective: To evaluate the CT features of renal pseudotumors and the differential diagnosis with renal carcinomas and other benign tumors, emphasis on the origin of pseudotumors and the factors liable to be misdiagnosed.Methods:Unenhanced and enhanced spiral CT findings in 23 cases of renal mass were retrospectively evaluated.13 of them(inflammatory pseudotumor, 5 cases;Xanthogranulomatous pyelonephritis,2 cases;granulomatous inflammation,1 case;liparomphalus hyperplasia,1case;fibroangiolipoid hyperplasia,1 case;adenomyosis,1 case;and hematomas,2 cases) were resected and pathologically confirmed.The others\ were diagnosed by IA-DSA or followed up after the treatment.Results:Most inflammatory and hyperplasia diseases appeared as a solid or solid-cystic heterogeneous mass,with an ill-defined margin;Calcification or fat tissues sometimes could be seen.After intravenous administration of iodinated contrast media,the solid components enhanced mildly or moderately.Cystic components,infiltration of fatty renal capsule and thickening of renal fascia could be seen.Hematomas and aneurysms appeared as isoattenuation to hyperattenuation lesions,with a well-demarcated margin.Aneurysms demonstrated intense enhancement similar to the abdominal aorta.Acute hematomas could enhanced mildly.Conclusion:CT is helpful to the diagnosis and differential diagnosis of renal pseudotumors.

Application of Diffusion-weighted MR Imaging and Diffusion Tensor Imaging in Brain Tumor Diagnosis and Evaluation / 医疗卫生装备

Objective To discuss the application of DWI and DTI in diagnosis and evaluation of brain tumor. Methods Combining with literatures, the application of DWI and DTI in brain tumor diagnosis, differential diagnosis, tumors classi- fication, preoperative evaluation, operation plan establishment, follow-up role of treatment were reviewed and evaluated. Results The DWI and DTI were available to brain tumor diagnosis, differential diagnosis and tumor grade. The DTI could be clearly shown the influence of tumor with white matter quality, it was important in operation plan establishment. The combination of intra-operative MRI, functional MRI and DTI was valuable for brain tumor resection. In the meantime, the treatment response of tumor and the changes of treatment-induced white matter were accurately assessed by DTI. Conclu- sion With the MRI hardware and software technology development, the DWI and DTI imaging information can be provided important value in brain tumor pathological changes diagnosis, evaluation, therapeutic planning and post treatment assess- ment.