Order of appearance of the paranasal sinuses:
MEFS (maxillary, ethmoid, frontal, sphenoid)
Maxillary and ethmoid present at birth.
Frontal and sphenoid develop later.
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)
Again MEFS (maxillary mc, sphenoid least common)
Order of appearance of the PNS on xray:
MESF
Max 4 to 5 mths
Ethmoid 1 yr
Sphenoid 4 yrs
Frontal 6 yrs.
MESF
Max 4 to 5 mths
Ethmoid 1 yr
Sphenoid 4 yrs
Frontal 6 yrs.
Frequency of osteoma is FEMS
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