The unexpected difficult airway and lingual tonsil hyperplasia: a case series and a review of the literature.

BackgroundAn unexpected difficult intubation occurs because physical examination of the airway is imperfect in predicting it. Lingual tonsil hyperplasia (LTH) is one risk factor for an unanticipated failed intubation that is not detectable during a routine oropharyngeal examination. The authors atte