Dr. Ryo AndoJapan
Chiba Children's Hospital
| 2020 to present | Chief Surgeon, Department of Pediatric Neurosurgery, Chiba Children’s Hospital |
| 1998 - 2004 | School of Medicine, Tsukuba University (M.D.) |
| 2004 - 2009 | Residency, Department of Neurosurgery, Asahi General Hospital |
| 2009 - 2010 | Medical staff, Department of Pediatric Neurosurgery, Chiba Children’s Hospital |
| 2011 - 2012 | Senior Surgeon, Department of Spinal Surgery, Kameda Medical Center |
| 2012 - 2014 | Medical staff, Department of Pediatric Neurosurgery, Chiba Children’s Hospital |
| 2014 - 2020 | Senior Surgeon, Department of Pediatric Neurosurgery, Chiba Children’s Hospital |
Pediatric neurosurgery, Spine surgery especially in the field of CVJ such as Chiari and Skeletal Dysplasia
Membership of Medical Societies
The Japan Neurosurgical Society
The Japanese Society for Pediatric Neurosurgery
The Japanese Society of Spinal Surgery
The Japanese Society for Neuroendoscopy
Japan Medical Society of Spinal Cord Lesion
International Society for Pediatric Neurosurgery (ISPN), active member
Academic Award
2015 Best Paper Award, Symptomatic Chiari type-2 malformation. To operate or not to operate? Consideration of its natural history. 1st Congress of Asian-Australasian Society for Pediatric Neurosurgery and Inaugural Meeting
2015 Best Presentation Award, Decompressive surgery for high cervical stenosis in metatropic dysplasia. The 27th Annual Meeting of KSPN and 2015 JSPN-KSPN Joint Meeting
Craniovertebral junction anomalies in skeletal dysplasia
1109 13:20-13:35
Interim Meeting of AASPN/303A
The author will describe the surgical management of craniovertebral junction (CVJ) surgery on three specific types of skeletal dysplasia in children.
The most common skeletal dysplasia is achondroplasia, which can present foramen magnum stenosis (FMS) due to the endochondral ossification dysfunction in the skull base. Among the 18 patients who were referred to our department for the treatment of FMS, 13 patients were surgically indicated because of radiological spinal cord compression. The most standard surgical procedure was foramen magnum decompression (FMD) with C1 laminectomy, however, surgeon needs to pay special attention for the hypertrophic edge of foramen magnum not only on posterior aspect but also on lateral aspects. This can cause the surgery for achondroplasia a little bit complicated.
The second skeletal dysplasia is chondrodysplasia punctata (CDP), which is characterized by punctate calcification of the spinal vertebral body and the other systemic bone. Spinal instability can occur due to hypoplasia of the anterior element of spinal column ranging from CVJ to lower cervical spine. Among eight patients of CDP, one underwent posterior fusion, two went through FMD with C1 laminectomy accompanying with cervical collar wearing, and the rest were treated conservatively with cervical collar so far. The treatment strategy depends on the degree of instability and predictive durability toward spinal fixation, especially applicability of spinal instrumentation.
The last skeletal dysplasia described here is metatropic disyplasia, so named because of the progressive spinal deformity. Though it is reported the patients tends to have CVJ instability, among our four patients, two underwent decompression without fusion. Within the average follow-up period of 11.8 years after the surgery, both showed no subsequent instability and upper extremities function was kept stable so far.
The understandings of the clinical characteristics of each skeletal dysplasia are the key for appropriate management on CVJ lesions.