Missed skull base injury during sinonasal surgery: A dangerous scenario still existing.

Skull base injury is a known complication of sinonasal surgery. Cerebrospinal fluid (CSF) rhinorrhea has been reported to occur in 0 to 2.5% of these procedures. More extensive skull base injury may result in more serious complications. In this retrospective case series, we report on 7 cases of iatrogenic skull base injury due to sinonasal surgery that was missed by the operating surgeons. Included were 5 male and 2 female patients. Six patients sustained the skull base injury during endoscopic sinus surgery, and 1 patient was injured during septoplasty. Two patients presented with CSF rhinorrhea alone, 2 patients had repeated episodes of meningitis, 2 patients had other neurologic sequelae, and 1 patient had exotropia due to associated orbital injury. We conclude that skull base injury due to sinonasal surgery is still being missed; this oversight may lead to potentially fatal results. The true incidence of this complication is probably still unknown.