측두골 유양도출정맥의 형태와 임상적 특징

Clinical features of mastoid emissary vein of temporal bone

Introduction & object : Mastoid emissary vein (MEV) complex is one of the superficial venous systems of posterior neck. It could be a potential source of bleeding during flap elevation or might be an obstacle to bone work for hearing device surgery. The objective of this study is to evaluate the morphometric analysis of MEV complex using 3-d reconstruction of temporal bone CT. Materials & Method : From the normal adults TBCT aged from 20 to 60, twenty identifiable MEV cases without history of head trauma, otitis media, neurological disease, and skull surgery including mastoid surgery were evaluated. Morphometric parameter of MEV angle from sigmoid sinus, the length of MEV from the branch of sigmoid sinus to the bony aperture mastoid bone, distance from mastoid tip to the bony aperture of MEV, distance from asterion to the bony aperture of MEV, distance from asterion to mastoid tip, perpendicular length from bon aperture of MEV to the imaginary line which pass asterion and mastoid tip, perpendicular length from bon aperture of MEV to the imaginary temporal line. Conclusions : Preoperative evaluation of MEV is recommended for the retrosigmoid bone work or periosteal flap elevation. Three dimensional reconstruction of MEV might helpful for the imaginary information for the surgeon.