To evaluates the efficacy of four-quadrant method in CT and MRI for diagnosis and differential diagnoses of the orbital tumor. The location of the orbital tumor was assigned to: superolateral, superomedial, inferolateral, inferomedial, and optic never were considered as the center point.
Methods: From Sep-2008 to April-2016 a total of 87 cases of orbital tumor were included in study. All included orbital tumors were verified radiologically and histopathologically. Forty nine patients underwent CT scanning and 38 patients underwent MR Imaging. We classified the orbital region according to four-quadrant location method and eight spaces. The frequency distribution of individual CT and MR imaging features in the benign tumor was compared with malignant tumor by using Chi-square tests.
Results: Among the 87 cases of the orbital tumor, 70 cases (80.45%) were benign tumor and 17 cases (19.54%) were malignant tumor. Regarding the four-quadrant location of the orbit, 41 lesions (47.12 %) were in superolateral, 18 lesions (20.68%) in inferolateral, 16 lesions (18.39%) in inferomedial, 8 lesions (9.19%) in superomedial, 3 lesions (3.44%) in globe, 1 lesion (1.14%) was in optic nerve. There was significant difference in four quadrant location by comparing benign with malignant tumor (P=0.023). Hemangiomas were the predominant benign lesion and lymphoma was major type of malignancy.
Conclusion: The four-quadrant and eight-space (FQES) division of the orbit may play an important role in determining the anatomical location, origin and nature of orbital tumor, and aid in diagnosis and treatment.