18 - Development and Growth of ParaNasal sinuses

SINUS	STATUS AT BIRTH And First radiological evidence	GROWTH
Frontal sinus	Not present; First radiological evidence at 6 years of age	Invades frontal bone at the age of 4 years. Size increases until teens.
Sphenoid sinus	Not present; First radiological evidence at 4 years of age	Reaches sella turcica by the age of 7 years, dorsum sellae by late teens and basisphenoid by adult age. Reaches full size between 15 years to adult age.
Maxillary sinus	Present at birth; First radiological evidence at 4-5 months of age	Rapid growth from birth to 3 years and from 7-12 years. Adult size – 15 years .
Ethmoidal sinus	Present at birth -Anterior group = 5x2x2mm -Posterior group = 5x4x2 mm; First radiological evidence at 1 year of age	Reach adult size by 12 years