The sine paranasal mucoceles are pseudocystic lesions, described since the 19th century, originating in one or several cavities of the paranasal sinuses and its development depends on the speed of progressive expansion of the area involved. The chronic mucous inflammation is associated with obstruction of the natural drainage of the sinuses. This is a female patient 17 years old with a picture of the vertex headache that is transmitted by the neurologist for a otolaryngologic evaluation, consultation with several experts predicted without reaching any diagnosis that explains it. In 6 months of developing insidious onset, accompanied by minimal intermittent nasal congestion. Nasal endoscopy is carried out without major breakthroughs and later a computerized scan in which notes opacification of the right posterior ethmoid sinus. It holds an anterior and posterior ethmoidectomy right with which the inflammatory tissue is removed and overcomes the frame. Following a year with good development.