Intraoperative computed tomography for cervicomedullary decompression of foramen magnum stenosis in achondroplasia: two case reports.

[achondroplasia]

The authors report two cases of cervicomedullary decompression of foramen magnum (FM ) stenosis in children with achondroplasia using intraoperative computed tomography (iCT ). A 14 -month -old girl with myelopathy and retarded motor development , and a 10 -year -old girl who had already undergone incomplete FM decompression was presented with myelopathy . Both patients underwent decompressive sub-occipitalcraniectomy and C 1 laminectomy without duraplasty using iCT . It clearly showed the extent of FM decompression during surgery , which finally enabled sufficient decompression . After the operation , their myelopathy improved . We think that iCT can provide useful information and guidance for sufficient decompression for FM stenosis in children with achondroplasia .