Tumor puncture and spillage were the only variables that have an independent effect on recurrence, 26.9% of punctured tumors and 80% of cases of spillage recurred (P = .043 and P = .035, respectively). Although tumor size, safety margin, and adherence to facial nerve are related to recurrence, logistic regression suggests that these are confounding variables influencing recurrence through effect on puncture and spillage rates.
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Riad et al. (2011) studied this question.
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