The described tumors of the brachial opening for Ascherson in 1932 are joint laterocervical that come from the abnormal development of a branchial arc. It can appear in adults, young and 2th branchial arc is the responsible one of 90% of the formation of these tumors. The tumors of the first branchial arc locate next to the auricular set and the parotid one, of the third and room arc are of posterior localization. Of the first arc they only divide in type I or abnormal ectodermal duplication of CAE with squamous epithelium. Parallel to the CAE, Pretragal, posterior auricular. Type II in the forebody of the neck, superior to hyoid is presented in a teenager of 13 years old, of masculine sex, without base pathology, that consultation for presenting a tumor to right retroauricular, of seven years of evolution, that presents with inflammatory symptoms of 2 the 3 times to year, where is partially converted with antibiotics and surgical draining. When examined it presented: injury to right retroauricular, to nodular superficial of 2, 5 of bigger diameter, not followed of cervical adenomegalias. The remaining portion of the physical examination without particularitities. An ultrasound that informs formation of tumor characteristics, of 9 mm of bigger diameter is become fulfilled. A carcinogen injury in mastoid relation carried through surgical exceresis having as hallazgo operative apophysis, subsequent to parotid gland and inferior to the external auditory canal presenting fistula with this finish. The pathological anatomy informs hallazgo compatible with the branchial tumor.