Paranasal sinuses are the cavities at the skull that make
it lighter in relation to its volume. Sinuses are present
on both sides at their locations either frontal, ethmoid,
maxillary, or sphenoid sinuses [1]. Aplasia or agenesis
of sinuses can occur alone or in association with other
syndromes and can occur also unilateral or bilateral [2].
Frontal and maxillary sinuses are the most common site
for agenesis. Researches about frontal sinus agenesis were
conducted in Saudi Arabia [1], Turkey [2], and India [3],
which revealed an incidence ranging from 2.5 to 3.8%.
So generally it is not a common finding. The incidence
of unilateral frontal agenesis is relatively more common
than bilateral. The right side is more affected than the
left, and it is relatively more common in females than in
males [1–3].