Bilateral aplasia of the frontal, sphenoid and maxillary sinuses and unilateral aplasia of the ethmoid air cells

Background: Sporadic cases of sinus aplasia have been reported in the literature, but only a few cases of total aplasia of paranasal sinuses have been recorded. In this report, we aim to present a case of aplasia of all paranasal sinuses except for the right ethmoid sinus which was hypoplastic. Case Report: The patient was a 50-year-old female referred for obtaining Cone Beam Computed Tomography (CBCT) prior to dental implant placement. The patient was asymptomatic and did not have any complaints or discomforts associated with the craniofacial structures. CBCT views showed bilateral absence of paranasal sinuses. Only two ethmoid air cells were detected on the right side. Conclusion: This is the first case report for aplasia considering paranasal sinuses except for right ethmoid cells which were hypoplastic in Iranian population.