To compare functional endoscopic sinus surgery with a combined approach (functional endoscopic sinus surgery plus Caldwell–Luc procedure) for the treatment of paediatric antrochoanal polyp, in terms of antrochoanal polyp recurrence and safety.

This retrospective case series comprises 27 paediatric patients with recurrent antrochoanal polyp, treated from January 2010 to January 2018.

The average age of the patients at the time of diagnosis was 10.4 ± 2.49 years. The recurrence rate after functional endoscopic sinus surgery alone was 72.9 per cent, compared with 12.5 per cent after functional endoscopic sinus surgery plus the Caldwell–Luc procedure (p < 0.00001). No complications were reported during surgery or follow up.

The correct identification of the origin of the antrochoanal polyp and an adequate returning of maxillary ventilation by widening the ostium can prevent recurrences. Although functional endoscopic sinus surgery continues to be the ‘gold standard’ for antrochoanal polyp treatment, in cases of revision surgery, a combined approach could ensure the complete removal of the polyp through the two openings.

To present a previously unreported cause of frontal mucocele.

A patient presented with a frontal mucocele and maxillary sinusitis. Computed tomography revealed an ectopic maxillary tooth as the cause of her signs and symptoms. Removal of the tooth by a Caldwell–Luc procedure facilitated resolution of the mucocele. Conventional treatment of mucoceles by endoscopic sinus surgery, and other rhinological sequelae of ectopic teeth, are considered.

This is the first documented case of an ectopic tooth causing a frontal mucocele, and demonstrates how effectively the patient's symptoms resolved on removal of the tooth.