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Diseases of PNS

Question
2 out of 38
 

Sinus not present at birth is: [DNB Dec 2009]



A Ethmoid
B Maxillary

C Sphenoid
D None

Ans. C Sphenoid sinus

Ref. Scott Brown 7th/ed Vol 2, p 1320;

Development and grwoth of paransal sinuses

Sinus

At birth

Adult size

Growth

Radiological appearance (age)

Maxillary Ethmoid Frontal Sphenoid

Present

Present

Absent

Absent

15 years

12 years

13-18 years

12-15 years

Biphasic growth: Birth-3 years, 7-12 year

Size increases up to 12 years

Invades frontal bone (2-4 yrs), size increases until teens

Reaches sella turcica (7 yrs), dorsum sellae (late teens), basisphenoid (adult)

4-5 months

1 year

6 years

4 years

Diseases of PNS Flashcard List

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