Table 1.

The clinical characteristics of patients undergoing endoscopic transnasal odontoidectomy for basilar invagination

Patient	Age (year-old)	Sex	Diagnosis	Symptom on admission	Complication	Time of extubated and oral food intake	JOA score		Fellow-up period(months)
							Preoperative	Postoperative
1	53	Male	BI, AA, K-F syndrome	Neck stiff, bilateral upper limbs, unsteady gait	No	2nd day	12	17	30
2	42	Female	BI, AA	Neck pain, bilateral upper limbs numbness, eight side body paresthesia, walking difficulty, bladder urgency	CSF leakage	2nd day	8	16	26
3	59	Female	BI, AA	Neck stiff, bilateral upper limbs numbness, low limbs numbness	No	2nd day	15	17	24

BI basilar invagination, AA atlanto-occipital assimilation, K-Fsyndrome Klippel-Feil syndrome, JOA Japanese Orthopaedic Association score