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Journal of the Korean Neurological Association 2000;18(3): 304-310.
편측성 안면경련의 측두골 자기공명영상 검사
김선곤 김진호 ‡ 양진우 이현정 정태섭*손영호 † 김진수 † 이명식, 김선곤 김진호 ‡ 양진우 이현정 정태섭*손영호 † 김진수 † 이명식
연세대학교 의과대학 영동 세브란스 병원 신경과,진단방사선과*,신촌 세브란스 병원 신경과 † 조선대학교 의과대학 신경과학교실
Temporal Bone Magnetic Resonance Imaging Study in Hemifacial Spasm
Sun Kon Kim, M.D., Jin Ho Kim, M.D. ‡ , Jin Woo Yang, M.D., Hyun Jeong Lee, M.D., Tae Sub Cheong, M.D.*, Young Ho Sohn, M.D. † , Jin-Soo Kim, M.D. † , Myung Sik Lee, M.D.
Department of Neurology and Neuroradiology*, Yongdong Severance Hospital Department of Neurology, Shinchon Severance Hospital † , Yonsei University College of Medicine Department of Neurology, Chosun University College of Medicine ‡
Abstract
Background : Hemifacial spasm (HS) has been attributed frequently to vascular compression of facial nerve root exit zone from brainstem. A recent brain CT scan study showed that patients with HS had narrower posterior fossa than normal controls. However, cause relationship between narrowed posterior fossa and vascular tortuosity is unknown. Methods : In 25 patients with HS and 29 controls, using temporal bone MRI, we measured petrous angle (PA) and pons diameter index (PDI) to define correlation between severity of posterior fossa narrowing and compression to brainstem. We compared severity of narrowing of posterior fossa between patients with and without tortuous arteries in posterior fossa. We also compared degree of narrowing of posterior fossa and clinical severity of HS. Results : The mean (±standard deviation) of PA of 24 patients with HS (115.5 ±6.0 °) was significantly smaller than that of controls ( 1 1 8 . 6 ±4 . 8 °). The mean (±standard deviation) of PDI of patients with HS (82.5 ±4.7%) was significantly greater than that of controls (77.3 ±3.7%). However, there was no correlation between PA and PDI in patients with HS. There was no correlation between degree of narrowing of posterior fossa and clinical severity of HS. Conclusions : Patients with HS have narrower posterior fossa as compared with controls. However, narrow posterior fossa does not seem to be a single important factor causing deformity of brainstem or tortuous arteries in posterior fossa. J Korean Neurol Assoc 18(3):304~310, 2000 Key Words : Hemifacial spasm, Temporal bone, MRI scan, Posterior cranial fossa