Phenytoin-induced lingual tonsil hyperplasia causing laryngeal obstruction

The effects of phenytoin sodium on lymphoid tissue have been known for some time. However, its effect on the lymphoid tissue of Waldeyer's ring is unr eported in the otolaryngology Literature. We present the case of a 78-year- old woman who was treated with phenytoin for generalized tonic-clonic seizu res for 4 months and who subsequently developed lingual hyperplasia that ca used laryngeal obstruction eventually requiring a tracheotomy. Of note, no history of airway compromise or difficulty with intubation from a prior ope ration 20 years ago was reported; these findings suggest that the lingual t onsillar hyperplasia was a consequence of phenytoin therapy and not a preex isting condition. The findings of histopathologic evaluation were consisten t with lymphoid hyperplasia without evidence of malignancy. We also report our operative management and follow-up of this rare condition.