Eosinophilic Esophagitis Secondary to Sublingual Immunotherapy Using the Aeroallergen Timothy Grass Pollen Allergy Extract: A Case Report

Eosinophilic esophagitis results in a chronic immune-mediated condition of the esophagus characterized by esophageal dysfunction and eosinophil-predominant inflammation. While food-based oral immunity therapy (OIT) is a recognized trigger for eosinophilic esophagitis, the impact of sublingual immunotherapy (SLIT) for aeroallergens is less well established. We present an unusual case of eosinophilic esophagitis in a 14-year-old male induced by SLIT and resolved after discontinuing SLIT with Timothy grass pollen allergy extract (GRASTEK®, ALK-Abelló, Inc., Bedminster, USA), which, to our knowledge, has not been previously reported.