Abstract:
BACKGROUND:For the prevention of postoperative CSF fistula a better understanding of origins and risk factors is necessary. OBJECTIVE:To identify the petrous bone air cell volume as a risk factor for developing CSF fistula, we performed a retrospective analysis. METHODS:From 2000 to 2007 519 patients had a retrosigmoidal surgical removal of a vestibular schwannoma. The 22 who had a postoperative CSF fistula were chosen for evaluation in addition to 78 patients who were randomly selected in 4 equally sized cohorts: male/female with small/large tumors. Preoperative CT scans were analyzed regarding petrous bone air cell volume, area of visible pneumatization at the level of the internal auditory canal (IAC), tumor grade, and sex. RESULTS:: Women developed nearly half as many CSF fistulas (2.7%) as men (5.2%). The mean volume of the petrous bone air cells was 10.97 mL (SD, 4.9; range, 1.38-27.25). It was significantly lower for women (mean, 9.23 mL; SD, 3.8) than for men (mean, 12.5 mL; SD, 5.28; P = .0008). The mean air cell volume of CSF-fistula patients was 13.72 mL (SD, 5.22). The difference concerning the air cell volume between patients who developed CSF fistulas and patients from the control group was significant (P = .0042). There was a significant positive correlation between the air cell volume and the area of pneumatization in one CT slide at the level of the IAC. CONCLUSION:The higher incidence of CSF fistulas in men compared with women can be explained by means of differently pneumatized petrous bones. A high amount of petrous bone pneumatization has to be considered as a risk factor for the development of postoperative CSF fistula after vestibular schwannoma surgery.
journal_name
Neurosurgeryjournal_title
Neurosurgeryauthors
Stieglitz LH,Giordano M,Gerganov V,Raabe A,Samii A,Samii M,Lüdemann WOdoi
10.1227/NEU.0b013e3181f88884subject
Has Abstractpub_date
2010-12-01 00:00:00pages
509-15issue
2 Suppl Operativeeissn
0148-396Xissn
1524-4040pii
00006123-201012002-00027journal_volume
67pub_type
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