6) The fact that maxillary sinusitis is more common than sphenoid sinusitis may explain why antrochoanal
polyps are more common than sphenochoanal polyps.
The most common type is the antrochoanal
polyp, which originates in the mucosa of the maxillary sinus or antrum.
Most choanal polyps arise from the maxillary sinus, and they are called antrochoanal
17), (19) An antrochoanal
polyp refers to a solitary lesion that arises in the maxillary antrum of a non-atopic person, increases in size to widen the sinus ostium, and then extends into the nasal cavity.
polyp refers to a solitary lesion that arises in the maxillary antrum of an atopic person, increases in size to widen the sinus ostium, and then extends into the nasal cavity.
polyps are far more common than polyps that originate in the ethmoid and sphenoid sinuses.
The differential diagnosis of nasopharyngeal cysts includes adenoid hypertrophy, branchial cleft cysts, meningoceles, meningoencephaloceles, antrochoanal
polyps, sphenochoanal polyps, and malignant tumors.
polyp, mucocele, thrombosis) and neoplastic lesions (e.
The differential diagnosis of a mass in the postnasal space covers a wide spectrum of pathologies, including antrochoanal
polyps, nasopharyngeal cysts, benign tumors and hamartomas (e.
The right-sided polyp mimicked an antrochoanal
polyp and extended posteriorly to the nasopharynx without involving the maxillary sinus.
2-4) Only one case of simultaneous antrochoanal
and sphenochoanal polyps has been reported in the literature.
The presentation of a sphenochoanal polyp is similar to that of the more common antrochoanal
polyp, but the two can usually be differentiated on computed tomography.