A search strategy was developed with the assistance of a medicine librarian and used in the literature search across selected databases. A comprehensive search of relevant articles was conducted in PubMed, CINHAL, Scopus, Cochrane Library and Web of Science databases in December 2025 and updated in February 2026. Keywords related to choanal atresia, endoscopy, stent, non-stented, and paediatrics were employed in the databases. Several keywords were joined using Boolean Operators such as “OR” and “AND” to generate more accurate results. The search query was refined based on each database’s syntax.

This review included pediatric studies evaluating endoscopic transnasal repair of choanal atresia. For the primary comparative analysis, eligible studies were required to include both a stented and a non-stented group. Single-arm studies evaluating only stented or only non-stented repair were retained as indirect supportive evidence and were not used as direct comparative evidence. Eligible designs included randomized trials, clinical trials, retrospective cohorts, prospective cohorts, and retrospective case series. Studies focused on pediatric populations, particularly neonates and infants. Studies that did not evaluate endoscopic transnasal repair, studies without relevant outcome data, case reports, conference abstracts, systematic reviews, meta-analyses, editorials, non-English publications, and studies involving adult populations without separable pediatric data were excluded.

Studies that did not evaluate endoscopic transnasal repair of choanal atresia, or that did not provide relevant outcome data, were excluded. Case reports, conference abstracts, systematic reviews, meta-analyses, and editorials were also excluded. Studies with unclear or insufficient outcome data, studies published in languages other than English, and studies in adult populations without separable pediatric data were excluded. Single-arm studies were not excluded solely because they lacked a comparator; instead, they were classified as indirect supportive evidence and were not included in the primary stented-versus-non-stented comparison.

Two reviewers independently reviewed and extracted data from the selected studies into a standardized Excel spreadsheet. Extracted variables included authors, year, study design, patient demographics, type of choanal atresia, comorbidities, surgical technique, mucosal-flap technique, vomer resection, postoperative dilation, topical therapy/postoperative medical treatment when reported, stent material and duration, and outcomes including patency, restenosis, surgical success, granulation tissue formation, and postoperative complications. Discrepancies were addressed through discussion or by engaging a third reviewer.

The Cochrane risk of bias (RoB 2) tool was used to assess the methodological quality of randomised controlled trials (RCTs) focusing on five domains: randomization process, missing data, deviation of intended intervention, measurement of outcomes and selection of results. The Newcastle Ottawa Scale (NOS) was used for quality assessment of non-randomized studies focusing on three key domains: selection, comparability and outcomes. Discrepancies were addressed through consensus or by engaging a third reviewer to break the tie.

Data from the selected studies were synthesized narratively. The primary comparison was restricted to studies containing both stented and non-stented groups. Single-arm studies were summarized separately as indirect supportive evidence and were not used to infer a direct comparative effect of stenting. The prespecified primary outcome was restenosis, defined as postoperative narrowing or closure of the surgically created choanal opening as reported by the individual study, assessed at the study-defined follow-up endpoint; where multiple follow-up time points were reported, the longest clinically evaluable follow-up was used for the narrative comparison. Patency, surgical success, and revision were treated as secondary outcomes because definitions and assessment time points varied across studies. Co-interventions and technical factors were also considered because they could independently influence outcomes.

Twelve studies were included, comprising 376 pediatric patients [5][11]-[21]. Seven studies directly compared stented and non-stented groups [5][13]-[16][20][21], whereas five studies were single-arm studies and were retained as indirect supportive evidence [11][12][17]-[19]. Sample sizes ranged from 7 to 112 patients. The patients ranged from neonates to adolescents, with infants and young children predominating. CHARGE syndrome and other congenital anomalies were reported in several cohorts. Endoscopic transnasal repair was the surgical approach across the included studies. Stent duration varied from several days to prolonged placement of up to 32 weeks. Because the included studies differed in disease severity, age, laterality, surgical technique, and postoperative management, direct outcome comparisons were considered heterogeneous (Table 1).

Table 1. Study characteristics.

The methodological quality was assessed using the Newcastle-Ottawa Scale for assessing risk of bias of non-randomized trials (Figure 2). Overall, studies showed low to moderate risk of bias. Three studies [14][17][20] demonstrated low risk of bias reflected by comparative designs, clear cohort selections and adequate follow-up. Several studies demonstrated a moderate risk of bias, with comparability being a common limitation within the studies. This implies that some studies lacked adjustment for key confounders, including the type of choanal atresia or age during initial surgery. Selection and outcome assessment were generally adequate, with studies demonstrating a well-defined pediatric population diagnosed with CA, and adequately reporting patency or stenosis over meaningful follow-up durations, though success outcomes varied across studies.

Across the 12 studies, surgical outcomes following endoscopic repair for choanal atresia demonstrated substantial variability. The primary comparative synthesis

Figure 2. Quality assessment using the Newcastle-Ottawa Scale for non-randomized trials.

was limited to the seven studies containing both stented and non-stented groups [5][13]-[16][20][21]. The five single-arm studies [11][12][17]-[19] were interpreted as indirect supportive evidence only. Differences in age, unilateral versus bilateral disease, syndromic status, surgical technique, and postoperative care limited direct attribution of outcome differences to stent use alone.

Patency was reported across most studies but was assessed using heterogeneous definitions and follow-up intervals. Among direct comparative studies, patency did not demonstrate a consistent advantage for either strategy. Some cohorts favored stented repair, whereas others favored non-stented repair, and several studies did not report directly comparable patency data for both groups. Single-arm studies reporting high patency after non-stented repair provide supportive but indirect evidence and should not be interpreted as evidence of superiority. Variation in mucosal preservation, flap technique, patient severity, stent duration, and follow-up may explain part of the observed range.

Restenosis was the prespecified primary outcome and was defined as postoperative narrowing or closure of the neochoana according to each study’s reported criteria. The assessment time point varied between studies; therefore, the longest reported clinically evaluable follow-up was used for narrative comparison when multiple time points were available. Among direct comparative studies, restenosis findings were heterogeneous. Several studies reported higher restenosis in stented groups, including comparisons in which stented versus non-stented rates were approximately 40% - 60% versus 15% - 25%; however, this range was not uniform across all comparative studies. Importantly, Saafan et al. [20] reported approximately 60% restenosis in the stented group versus 50% in the non-stented group, demonstrating substantial restenosis with both approaches. Single-arm studies also showed wide variability, including a small non-stented cohort with 100% restenosis [17]. Thus, the overall evidence suggests that restenosis is influenced by both stent use and important patient- and technique-related factors.

Granulation tissue formation was reported in several studies and varied substantially between cohorts. Higher rates were frequently observed with stenting, particularly with prolonged stent placement, but the outcome was not measured uniformly and was also influenced by stent material, mucosal trauma, and postoperative management. These findings support considering granulation as a potential stent-related complication while avoiding attribution of all between-group differences to stenting alone.

Surgical success was defined variably in the included studies, including definitions based on patency, absence or degree of restenosis, and need for revision [5][14][19]. Because these definitions and follow-up periods were inconsistent, surgical success was treated as a secondary outcome and was not pooled or interpreted as a uniform endpoint. Reported success ranged from 39% to 100%, reflecting substantial clinical and methodological heterogeneity (Table 2).

Table 2. Surgical outcomes for stented vs non-stented endoscopic repair.

Restenosis was the primary outcome, but the evidence did not show a uniform relationship between stent use and restenosis. Several comparative studies reported higher restenosis with stenting, while other comparative evidence showed substantial restenosis in non-stented groups as well. The small non-stented cohort with posterior vomer resection reported 100% restenosis [17], illustrating the potential influence of surgical technique and patient severity. Neonatal age, bilateral disease, syndromic associations, and postoperative complications were also associated with poorer outcomes across studies. These factors, together with differences in stent duration, material, mucosal-flap technique, and postoperative care, limit causal attribution to stenting alone.

Higher restenosis rates were observed in some neonatal cohorts with bilateral CA and congenital anomalies, particularly CHARGE syndrome, in both stented and non-stented approaches [5][13][15][17][20]. Co-interventions also differed between studies. The included literature describes mucosal-preserving flap approaches, including the mirrored L-shaped septonasal flap in non-stented repair, and vomer resection in some stentless procedures [17][19]. Stent material and duration also varied, including short-term soft/posteriorly positioned devices and longer stenting protocols. Postoperative dilation and topical therapy were not consistently reported across the included studies, preventing a reliable assessment of their independent effects. These differences may explain part of the heterogeneity in restenosis and patency outcomes.