The Evaluation of Spiral CT 3-D Reconstruction in the Diagnosis of Orbital Blowout Fracture

Objective To analyze spiral CT (SCT) volume scanning findings of orbital blowout fracture, to improve its early diagnosis.Materials and Methods SCT MPR, 3 D reconstruction and axial scan findings in 80 patients with orbital blowout fracture were retrospectively analyzed. Based on CT signs, the fractures were divided into 3 types: (1) blowout fracture of unilateral orbital wall; (2) blowout fracture of bilateral orbital walls; (3) mixed fracture, complicated with other direct facial fractures. Results The direct signs of orbital blowout fracture included continuity interruption, fragments, depression and displacement of orbital bony wall. Tear drop sign seen in the maxillary or ethmoid sinus was a characteristic indirect sign in inferior or medial orbital wall fracture. The other manifestation was thickened and enlarged extraocular orbital muscles.Conclusion SCT volume scanning and MPR, 3-D reconstruction is of great value in the diagnosis of orbital blowout fracture.