Résumé
Objective: To discuss the diagnostic value of the new 5-sector approach for orbital imaging division in the diagnosis of orbital space-occupying lesions. Methods: We retrospectively analyzed the clinical and imaging data of 374 patients with orbital space-occupying lesions. The distribution of the lesions was analyzed according to the new 5-sector approach for orbital imaging division (globe compartment, optic nerve compartment, intraconal compartment, extraconal compartment and extra-periosteum compartment) and the distribution rule of the lesions were discussed. Results: Hemangioma was the most common lesion among our group, with an incidence of 34.75%(130/374); 79.23% (103/130) of the hemangiomas were distributed in the intraconal compartment. There was a distributional difference between the lymphoma and inflammatory pseudotumor(χ 2 = 13. 63, P=0.001), with the former mainly located in the extraconal compartment and the latter often in the mixed compartments. We also found that there were distributional differences for those lesions which had more than 10 sufferers in our study(χ2= 788.058, P=0.001). Significant differences were also noted in the distribution of both benign and malignant lesions in the intraconal, extraconal and mixed type compartment(χintra/extra2=66.53, P extraconal compartment (56.12%,78/139)> mixed type(36.96%, 17/46); for the malignant lesions, the incidence order was: mixed type(63. 04%,29/46)> extraconal compartment(43.88%,61/139)> intraconal compartment(0.82%,1/122). Conclusion: There are distributional differences in orbital space-occupying lesions under the new 5-sector approach for orbital imaging division, indicating that the new 5-sector approach is helpful in the diagnosis of orbital lesions.
Résumé
Objective To study the value of fast dynamic contrast enhanced MRI in the diagnosis of orbital occupying lesions. Design Retrospective ease series.Participants 21 patients with orbital occupying lesions.Methods All the 21 patients were performed on fast dynamic contrast enhanced MRI and were verified by pathology.The raw datum were processed by the software of GE Functool. Parameters such as time-intensity curve(TIC),time to peak(Tpeak),1 minute enhancement ratio(ERlmin)and maximum enhancement ratio(ERmax)were analyzed to study the characteristics of orbital diseases on fast dynamic contrast-enhanced MRI.Main Outcome Measures TIC,ERlmin,and ERmax.Results The characteristics of TIC between benign diseases and malignant tumors were different. Of the 16 cases of benign lesions,12 demonstrated as continuous increasing type,and of 5 cases of malignant lesions,3 cases of lym- phoma were all platform type.The ER1min of the malignant tumors(150.47?42.18)was higher than that of the benign lesions (101.37?43.02)(P=0.021).Cavernous hemangiomas had special progressing enhancing model.Conclusions Fast dynamic contrast enhanced MRI is valuable to distinguish malignant tumors from benign occupying lesions.(Ophthalmol CHN,2007,16:305-308)