Thursday, 6 February 2014


Order of appearance of the paranasal sinuses: 
MEFS (maxillary, ethmoid, frontal, sphenoid)
Maxillary and ethmoid present at birth.
Frontal and sphenoid develop later.

Frequency of sinusitis/ carcinoma in the PNS:
Again MEFS (maxillary mc, sphenoid least common)

Order of appearance of the PNS on xray:
Max 4 to 5 mths
Ethmoid 1 yr
Sphenoid 4 yrs
Frontal 6 yrs.

Frequency of osteoma is FEMS

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