Organizing committee

Cholesteatoma of external auditory canal is a rare disease with an estimated incidence of 1 : 1000 of all patients seen in otologic practice. The purpose of this article is to present a case of this condition, with its main features and differential diagnosis, making it more easily recognizable in daily practice. Case Report: E.M.S 72 year-old male with chronic otorrhea in the left ear for about 8 months, with no improvement despite the use of different types of ear drops. Otoscopy revealed purulent secretion and bone erosion of the external auditory canal (EAC).The tympanic membrane had no perforation and its transparency was preserved. Computed tomography of the mastoid showed the erosion area in EAC (Grade III), without middle ear involvement. The histopathology was compatible with cholesteatoma. The treatment was surgical. Comments: The external auditory canal cholesteatoma is a difficult disease to diagnose because its clinical similarity to other external ear disorders .Obliterans keratosis and malignant otitis externa are the main conditions that should be considered as a diagnostic differential. CT scan is an important diagnostic tool to elucidate which of these primary lesions is present. A6282. Esthesioneuroblastoma: A Case Report Vanessa de Araújo Souza, Alexandra Torres Cordeiro Lopes de Souza, Mariana Azevedo Silva, Dario Hart Signorini, Eliana Freitas Cardoso, Ana Laura Carneiro Santos, Monik Souza Lins