Ethmoid cells display a considerable variability due to their extensive development. Pneumatization of middle turbinate intermediary one or several ethmoid cells is referred to "concha bullosa", which belongs to the frequent and clinically significant variations of bony nasal cavity. The collection of 309 (176 male and 133 female) adult dry skulls pertaining to the "Broumov Ossuary" (13th-18th centuries) was examined for the presence of concha bullosa. The appearance of the middle turbinate was evaluated by inspection. Only noticeably enlarged middle turbinates were rated as positive finding of concha bullosa. All positive findings of concha bullosa were also verified by their probing; coronal CT examination of the nasal cavity and paranasal sinuses was performed in seven of them. Concha bullosa was diagnosed in 160 skulls (51.77%).