The Mastoiditis of Mouret as a collection of purulent deep beneath the disgastric muscle in the space retroestileo. Is produced by the fusion of groups of deep subantral celda of Mouret, inside the digastric groove. A female patient of 35 years old, the othorrea in the right ear of one month of evolution, 15 days before the consultation is to prevent tumors in the posterior triangle neck, painful, slow growth with signs of inflammation, five days before it adds to the dysphagia solid so he consulted the hospital in your local hospital is treated with Ceftriaxone every 12 hours, four days before neck stiffness is added to accentuating dysphagia to liquids, so they sent to our service. Physical examination: right posterior wall of the oropharynx with excavation deep, pus, awesome extend toward the parapharyngeal region, ears, edematous cae which makes visualization of MT, othorrea; Neck: right posterior triangle of 6 cm fluctuating swelling, stiff neck lateralization and hyperextension, right facial palsy. Otomicroscopy: epithelial migration. Realize performs: it turns out great collection at the neck, with hypocellular mastoids, single cavity, and a tumor in the mastoid region with density of soft parts. Held drainage set neck and a second time noting performs classical radical mastoidectomy is more caja epimerized migration epithelial behind 15 days of mastoidectomy is verified improvement of paralysis.