Table 6. Prevalence of anatomical variations in the sinonasal region.

MS: maxillary sinus

Empty cells correspond to not reported data.

First author, year	n	Accessory maxillary ostium (%)	MS hypoplasia (%)	MS septum (%)
Keast, 2008 [6]	150		7
Hung, 2019 [5]	160	47.2
Turna, 2014 [10]	6224		2.4
Fadda, 2012 [15]	200		4	7
Jain, 2012 [19]	77	32
Dasar, 2016 [22]	400	21.8	8	5.3
Kaplanoglu, 2013 [31]	500	16.4	0.8	12.4
Yazici, 2019 [41]	120		5
Amine, 2020 [42]	300		5	34.6
Selcuk, 2008 [43]	330		4.6	22.8
Yenigun, 2016 [44]	377	19.1
Bani-ata, 2020 [45]	928	29.5