frontal sinüs endoskopik sinüs videoları kaynaklar
https://www.researchgate.net/publication/221888739_Management_of_intractable_spontaneous_epistaxis/figures?lo=1 http://entokey.com/frontal-sinus-surgery/#F4-46 http://www.slideshare.net/ajaymanickam87/frontal-sinus-procedures http://slideplayer.com/slide/3853775/