Rare anatomical variations in paranasal sinuses

Paranasal sinuses are known to demonstrate large anatomical variations. The hypoplasia or aplasia of paranasal sinuses is a rare clinical condition referring mainly to the frontal and maxillary sinuses . The combined aplasia of sphenoid, frontal and maxillary sinuses with the hypoplasia of ethmoid sinuses are overly among rarely encountered entities. Here, we present a 38-year-old woman without any syndromes or skeletal disease, combining the aplasia of sphenoid, maxillary and frontal sinuses with the hypoplasia of ethmoid sinuses.