1. Pneumocele of the frontal sinus;Canadan;Laryngorhinootologie,1990
2. Pneumocele of frontal and sphenoid sinuses;Jarvis;J Laryngol Otol,1974
3. Pneumocele and/or pneumosinus dilatans;Lovrencic;Symp Otorhinolaryngol,1987
4. Spontaneous ethmoid pneumocele in chronic maxillary and ethmoid sinusitis and polyposis;Meyer Bretting;HNO,1978
5. Sphenoid sinus pneumocele;Som;Arch Otolaryngol,1983