Eosinophilic esophagitis is an exceptional entity, although the number of published cases has increased three times during the last 3 years. We report the case of an 18-year-old male with a long esophageal stenosis due to eosinophilic esophagitis. Clinical, radiologic, endoscopic and manometric outcome was satisfactory after prednisone therapy. Although isolated esophageal involvement may occur, disseminated eosinophilic esophago-gastro-intestinal disease is more frequent. The disease is usually diagnosed in young male patients, presenting with dysphagia and, to a lesser extent, chest pain. Previous allergic conditions are reported in 80% of cases and peripheral eosinophilia is present in 80% of patients. Esophageal stenosis is present in 72% of cases and manometric alterations are found in 47% of patients. Radiographic findings are nonspecific and include stenosis and rigidity. Endoscopic features are not specific either, but diagnosis may be achieved by endoscopic biopsy. Corticosteroids and sodium chromoglycate have proved to be useful, with good therapeutic response being reported in 90% of patients with this underestimated disease.