Bilateral antrochoanal polyp: report of a new case and systematic review of the literature.

Antrochonal polyp (ACP) is a benign, rare, and generally unilateral tumor which originates from the maxillary sinus mucosa. Bilateral ACP is extremely rare. Only few cases have been documented in the literature until 2018. The authors report the case of a 44-year-old women, who presented with a bilateral progressive nasal obstruction for the past 2 years, slight headache and a decreased sense of smell has been started in last four months. Nasal endoscopy revealed pale polypoidal masses in nasal cavities, arising from each middle meatus and extending to the nasopharynx. Computed tomography of the paranasal sinuses revealed the presence of soft-tissue masses in the maxillary sinuses, passing through the maxillary ostium, and extending into the corresponding nasal cavities, and posteriorly upto the nasopharynx. The other sinuses were normally aerated. The tumors were removed surgically with a nasal endoscopy technique. Histopathology examination the two lesions revealed benign inflammatory nasal polyps.