Table 1. Patients and pathologies addressed by endoscopic endonasal approach with intraoperative computed tomography (IO-CT).

Patient	Sex	Age	Surgery date	Pathology	Evidence of residual compression on initial IO-CT scan
1	F	11	08/2008	Basilar invagination with retroflexed odontoid process	No
2	M	74	09/2008	Odontoid pannus	Yes
3	F	18	10/2008	Basilar invagination with chiari	No
4	F	71	10/2008	Odontoid pannus with synovial cyst	No
5	F	10	02/2009	Basilar invagination	Yes
6	F	41	03/2009	Os odontoideum with C1–2 subluxation	No
7	M	31	08/2009	Cranial settling s/p chiari decompression and previous transoral resection	No
8	F	9	09/2009	Basilar invagination	No
9	F	79	11/2009	Basilar invagination s/p chiari decompression	Yes
10	M	79	11/2009	Basilar invagination	Yes
11	F	61	03/2011	Basilar invagination	No