AGE AND APPEARANCE OF SINUSES
At birth: maxillary, anterior and posterior ethmoidal sinuses. They are present in utero. Only ethmoidal sinuses are pneumatized at birth.
5-6 years: frontal and maxillary sinuses. They begin to develop by age 1-2 years, but are not seen radiographically until 5-6 years of age.
Frontal sinuses begin to develop at 7 -8 years of age and completely develop in addescence.
In a 4-year-old girl, all sinuses are present except frontal and sphenoidal. The maxillary sinuses are not pneumatized until 4 years of age.
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