| Objective: To study the value of imaging division and dynamic contrast enhanced MRI in the diagnosis of orbital lesions. Methods: The study was divided into two parts: part one, according to new 5-sector method (globe compartment, optic nerve compartment, introconal compartment, extroconal compartment and extro-periosteum compartment), 374 cases of orbital lesions confirmed by pathology were analyzed on the bases of their distribution; part two, the dynamic contrast enhanced MRI images of 31 patients with orbital lesions were analysed. Results: There were distributional differences between lymphoma and inflammatory pseudotumor(χ2=13.63, P=0.001<0.01). The constituent ratio of diseases in orbital compartments was different. The distributional differences of benign and malignant lesions among introconal , extroconal and mixed type compartment had statistical significance(χ2intro-/extro-=66.53 , P<0.001;χ2intro-/mixed =88.17, P<0.001;χ2extro-/mixed=5.078, P=0.24<0.05). The one minute of enhancement ratio (ER1min) and the maximum upgrade slope rate (Slopemax) were significantly different between the malignant tumors and the benign lesions(t=2.411,P=0.022<0.05; t=5.89,P<0.001). Conclusion: Orbital division and dynamic contrast enhanced MRI are helpful to the diagnosis of orbital diseases.
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