换一批
换一批摘要篇首： Aatrochoanal polyp (ACP) is an infrequent, benign polypoid lesion that stems from the edematous mucosa of the maxillary sinus, grows from the natural or accessory ostium to the middle meatus, and protrudes toward the choana and nasopharynx.1 Although the exact causes of ACP are still unknown, chronic sinusitis, allergy,and lower respiratory tract infections are often related to ACP.2 Our report is an ACP arising from a secondary infection of the pefiapical granuloma in the maxillary sinus.
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