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논문 기본 정보

자료유형
학술저널
저자정보
김규선 (한림대학교 의과대학 안과학교실) 윤대영 (한림대학교 의과대학 안과학교) 조소연 (한림대학교 의과대학 안 과학교) 김영춘 (한림대학교 의과대학 안과학교) 김호철 (한림대학교 의과대학 안과학교) 이정근 (한림대학교 의과대학 안과학교) 최철순 (한림대학교 의과대 학 안과학교) 배상훈 (한림대학교 의과대학 안과학교) 김정우 (한림대학교 의 과대학 안과학교실)
저널정보
대한영상의학회 대한방사선의학회지 대한방사선의학회지 제34권 제4호
발행연도
1996.1
수록면
463 - 468 (6page)

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Purpose : To access the usefulness of magnetic resonance(MR) in the evaluation of orbital blowout fracture. Materials and Methods : Fourteen patients with orbital blowout fractures diagnosed by plain radiography(n=8) or computed tomography(CT)(n=6) were examined with MR. Twenty blowout fractures including six patients with two lesions were presented and the fracture site of the orbit was the medial wall in 11 cases and the orbital floor in nine cases. MR images in nine cases of six patients could be compared with CT scans. On MR images, we retrospectively evaluated the presence of fracture, herniation of orbital fat, abnormality of extraocular muscle, intraorbital hematoma and intrasinus hemorrhage. In nine cases we also compared these findings with CT scans. Results : Eighteen orbital blowout fractures with fat herniation could be diagnosed on MR images. In only nine of these 18 cases, the fracture itself could be seen on MR images as a disruption of the orbital wall, which produce a signal void. But two blowout fractures without orbital fat herniation, seen on CT, were not detected on MR images. Twenty abnormalities of extraocular muscle in 18 cases were depicted on MR images. There were no significant differences between MR and CT in the evaluation of orbital fat herniation and extraocular muscle abnormality ; however, in one case oblique sagittal MR images provided more useful information about the status of the inferior rectus muscle. Intraorbital hematoma was detected by MR in three patients. We were able to establish the presence of intraorbital hematoma by using the different signal intensities from fat or muscle on T1- and/or T2-weighted images. MR was found to be superior to CT in one case of intraorbital hematoma because of the iso-density of hematoma compared to muscle. MR also detected intrasinus hemorrhage which on T1-weighted images revealed high signal intensity in ten cases. MR was more valuable in demonstrating intrasinus hemorrhage in one case where a CT scan showed only hypodense fluid. Conclusion : MR is a useful diagnostic modality in the evaluation of orbital blowout fracture with orbital fat herniation. Compared with CT, it also provides more valuable information about associated extraocular muscle abnormality, subacute hemorrhage in the orbit and paranasal sinus.

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