Obliteración del seno frontal para el tratamiento de fístulas de LCR y meningoencefaloceles

endoscopic treatment of csf leak is the gold standard. nevertheless, at frontal sinus it is very difficult the endoscopic approach, especially if there is a meningoencephalocele associated. in these cases, an external approach with frontal sinus obliteration should be considered. we present two cases of csf leaks whose origin are meningoencephaloceles that protrude from posterior frontal sinus wall, treated with an external approach.