How obliteration of petrosal air cells by vestibular schwannoma influences the risk of postoperative CSF fistula

Widening of the IAC by tumor growth may leads to obliteration of air cells in the PW and therefore can be protective concerning CSF-fistula. At the same time patients with small tumors and a visible pneumatization in the PW must be expected to have a higher risk of CSF-fistula.