A case of eosinophilic granuloma in the temporal bone.

The following case reports a 4-year-old boy with a solitary eosinophilic granuloma in the right temporal bone. The patient complained of an inflammatory tumor in the right external ear canal. The histopathological diagnosis made based on the first specimen of the tumor in the right ear canal was foreign body granuloma. A polyp developed again in the right ear canal with postauricular swelling. Computerized tomography of the skull at that time showed an osteolytic defect in the right temporal bone filled with soft tissue. Diagnosis was established by finding of the presence of Birbeck granules in Langerhans histiocytes by electron microscopy.