All of the following paranasal sinuses are present at birth EXCEPT:

Ans. (c) Sphenoid sinusRef: Dhingra 5th Ed. / 203Development and Growth of paranasal sinusesSinusesStatus at the birthGrowthFirst radiologic evidenceMaxillaryPresent at birthRapid growth from birth to 3 years and from 7-12 years. Adult size-15yrs4-5 months after birthEthmoidPresent at birthReach Adult size by 12 years1 yearsFrontalNot presentInvades frontal bone at the age of 4 years. Size increases until teens6 yearsSphenoidNot presentReaches sella turcica by the age of 7 years.Reaches full size between 15 years to adult age4 years