Table I.

Anatomical variations of the paranasal sinuses and their prevalence in previous studies.

	Present study	Adeel et al. 2013 [10]	Fadda et al. 2012 [5]	Perez et al. 2000 [6]	Dutra et al. 2002 [12]	Mamatha et al. 2010 [13]	Mazza et al. 2007 [11]	Nouraei et al. 2009 [1]
Concha bullosa	35.3%	18.2%	2,8%	24,5%	4.2%	15%	29%	35%
Paradoxical middle turbinate	8%	14.3%	6.4%	10%	-	-	11%	-
UP pneumatisation	5%	5.2%	2.8%	none	-	-	5%	-
Haller cell	25%	9,1%	22.8%	45%	1.4%	17.5%	5%	12%
Onodi Cells	8%	7.8%	8.5%	10.9%	-	-	9%	-
Asymmetry of ethmoidal roof	62%	-	25.7%	-	-	-	-	11%
No. of cases	130	77	140	110	71	40	100	278