title: [Locally aggressive fibrous histiocytoma of the external ear canal].
abstract: This article reports on clinical as well as light-microscopical and electron-microscopical findings in a fibrous histiocytoma of the left external auditory canal. The patient, who was then 67 years old, complained of a space-occupying mass in the external auditory canal which resulted in partial deafness. On microscopical examination a 3 x 2 cm large tumour was found to be located at the boundary between the osseous and the cartilaginous auditory canal. The covering skin was intact. On histological examination we identified a moderately cellular, locally aggressive fibrous histiocytoma. To our knowledge, no fibrous histiocytoma of this localisation has ever been reported. The diagnosis can be made on histological grounds only. Differential diagnosis includes, besides a ceruminoma, almost all benign and malignant non-epithelial tumours of the external auditory epithelial canal. Surgical removal is the therapy of choice. One year after the operation there has been no relapse.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D004424:Ear Canal / Q000473:pathology*; D004428:Ear Neoplasms / Q000473:pathology*; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology*; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male
vernacular_title: Das lokal aggressive fibröse Histiozytom des äusseren Gehörganges.