Objective To improve the accuracy of diagnosis and differential diagnosis of nonossifying fibroma (NOF) by comparing with the image features of X-ray and CT and pathological characteristics,Methods The images of X-ray and CT of 28 patients underwent surgery and pathological confirmed NOF were studied retrospectively.Results NOF often occurred in the metaphysis of long bone or backbone with mild clinical symptoms.Eighteen lesions occurred in tibia,9 in femur and 1 in humerus.In 19 cortical cases,there was a single room or multiple rooms translucent zone in cortex or subcortex with dense surrounding.In 9 medullary cases,lesions as a single room or multiple rooms ranslucent zone with dense surrounding developed in the central area of the bone with thinning corex slightly bulg ed to periphery.Conclusion The images of NOF have some characteristic.X-ray and CT are very useful tools in diagnosis of NOF.Thin layer scanning and multiplanar reconstruction of multi-layers spiral CT can more clearly show the imaging features of NOF.

Objective To evaluate the diagnostic value of contrast-enhanced CT scans in diagnosis of traumatic splenic rupture. Methods The findings of unenhanced and contrast-enhanced CT scans of 34 cases with traumatic splenic rupture confirmed by operation were retrospectively reviewed. Results Of the 34 patients, the diagnoses of splenic rupture on unenhanced CT scans were certain in 23 patients and uncertain in 6 patients. No abnormalities were found in 5 patients(sensitivity 85.3%, specificity 67.6%). After intravenous administration of contrast material, all of the patients were diagnosed as splenic rupture(sensitivity 100%,specificity 100%).Conclusion Contrast-enhanced CT is important in diagnosis of traumatic splenic rupture and can obviously improve the diagnostic accuracy. It provides reliable information for clinical treatment.