Paranasal sinus present at bih among the following?: (A) Frontal and maxillary, (B) Ethmoid and maxillary, (C) Frontal and ethmoid, (D) Sphenoid and ethmoid
Answer is B. Maxillary sinus - Develop at bih; completely develop at 9 yearsEthmoidal sinus - Development at bih; completely develop at late pubeyFrontal sinus - Develop at 2 years; completely develop at late adolescenceSphenoid sinus - Develop at 3-5 years; completely develop at 12-15 yearsRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 211