Combined Aplasia of Frontal and Sphenoid Sinuses: A case report

INTRODUCTION AND IMPORTANCE: The paranasal sinuses are a group of four paired air-filled spaces located within the bony skull; maxillary, frontal, sphenoid, and ethmoid sinuses. Paranasal sinuses aplasia is a rare condition that is mainly confined to the frontal sinus unilaterally. Combined aplasia of multiple sinuses along with hypoplasia of other sinuses is extremely rare. This rare case should be considered in mind before scheduling any endoscopic sinus surgery to prevent complications during these surgeries. CASE PRESENTATION: A 13-year-old male patient presented to our ENT clinic complaining of a prolonged history of persistent headache, nasal obstruction, and nasal discharge. He also complained of bilateral ears fullness and facial pain. On physical examination, bilateral purulent nasal discharge with congested inflamed nasal mucosa and both inferior turbinate. The patient was diagnosed to have sinusitis and was started on treatment. The patient returns to our clinic after several weeks with minimal improvement. Computed tomography (CT was obtained and showed completely absent pneumatization of bilateral frontal and sphenoid sinuses. CLINICAL DISCUSSION: The development of the paranasal sinuses appears prenatally which can lead to a variety of PNS anomalies. However, the aplasia or hypoplasia of the PNS is found to be rare. Aplasia is mainly found in frontal and maxillary sinuses with a prevalence of 12 % and 6 %, respectively. While the prevalence of sphenoid sinus aplasia is extremely rare and found to be less than 0.7 %. Moreover, aplasia of multiple sinuses “combined aplasia” is an incredibly unusual finding. CONCLUSION: this patient is one of the extremely rare cases of the combined aplasia of frontal and sphenoid sinuses who was diagnosed and confirmed at an early age without any skeletal, systemic, or hematological abnormalities. Despite that, this rare case should be considered in mind before scheduling any endoscopic sinus surgery to prevent complications during these surgeries.