Osuagwu Ferdnand C, Lazareff Jorge A, Rahman Shayan, Bash Suzie
Department of Anatomy, University of Ibadan, Ibadan, Nigeria.
Childs Nerv Syst. 2006 Nov;22(11):1451-6. doi: 10.1007/s00381-006-0118-3. Epub 2006 May 30.
Cephalocranial disproportion was said to be responsible for Chiari I malformation after ventriculoperitoneal shunt. We aimed to evaluate if the volumetric characteristics of Chiari I after a ventriculoperitoneal shunt was due to a general volumetric reduction and if it is restricted to the posterior fossa.
Our results show that the posterior fossa volume, cisternal, clival length, and posterior cranial fossa volume ratio were reduced in the shunted group compared to the controls (p<0.05). Cerebellar and supratentorial volumes were similar between both groups. Craniocaudal extent, inferior, and superior tonsillar herniations were greater in the shunted group than control (p<0.05). The frontal occipital horn ratio in both groups was within normal range.
Chiari I anatomy after a ventriculoperitoneal shunt could develop in children and we propose a "posterior cranial fossa disproportion" rather than a "cephalocranial disproportion."
有人认为脑室腹腔分流术后的头颅比例失调是导致 Chiari I 畸形的原因。我们旨在评估脑室腹腔分流术后 Chiari I 的容积特征是否是由于总体积减少所致，以及是否局限于后颅窝。
我们的结果显示，与对照组相比，分流组的后颅窝容积、脑池、斜坡长度和后颅窝容积比均减小（p<0.05）。两组之间的小脑和幕上体积相似。分流组的颅尾长度、扁桃体下疝和上疝程度均大于对照组（p<0.05）。两组的额枕角比均在正常范围内。
脑室腹腔分流术后 Chiari I 解剖结构可在儿童中出现，我们提出“后颅窝比例失调”而非“头颅比例失调”。
