Environmental temperature and air humidity and prevalence of maxillary sinus retention cysts: possible relationships (preliminary study)

Surgical outcomes between two endoscopic approaches for maxillary cysts

OBJECTIVE

To compare recurrence rates and symptomatic relief in symptomatic maxillary sinus Retention Cysts (RCs) between Middle Meatus Antrostomy (MMA) alone and Inferior Meatus Antrostomy (IMA) with basal mucosa electrocoagulation.

METHODS

Patients with symptomatic unilateral maxillary RCs were randomly allocated to MMA (n=54) and IMA combined with mucosa electrocoagulation (n=53) groups. Symptomatic relief, cyst recurrence, and closure of the antrostomy opening were compared at 12-months postoperatively.

RESULTS

Symptomatic failure occurred in 13 (12.1%) patients, including 9 (16.7%) MMA and 4 (7.5%) IMA patients; this difference was not statistically significant (p=0.251). Postoperative cyst recurrence occurred in 16 (29.7%) and 1 (1.9%) patient in the MMA and IMA groups, respectively (p<0.0001). Closure of the opening occurred in 7 (13.0%) and 17 (32.1%) patients in the MMA and IMA groups, respectively (p=0.032). However, there were no significant pairwise correlations between closure of the opening and symptomatic failure or cyst recurrence.

CONCLUSION

IMA combined with basal mucosa electrocoagulation and MMA alone provided similar symptomatic relief for symptomatic maxillary RCs, but IMA had shorter operation times and lower postoperative recurrence rates of RCs.

LEVEL OF EVIDENCE

Level 1b.

Volumetric analysis of mucous retention cysts in the maxillary sinus: A retrospective study using cone-beam computed tomography

Purpose

The aim of this study was to evaluate the volumetric characteristics of mucous retention cysts (MRCs) in the maxillary sinus and to analyze potential associations of MRCs with dentoalveolar pathologies.

Materials and Methods

Cone-beam computed tomography (CBCT) scans exhibiting bilateral maxillary sinuses that were acquired from January 2016 to February 2019 were initially screened. A total of 227 scans (454 sinuses) that fulfilled the inclusion criteria were included. The presence, location, and volumetric characteristics of the diagnosed MRCs were evaluated on CBCT images using the 3D-Slicer software platform. The presence of MRCs was correlated with potential influencing factors including age, sex, and dentoalveolar pathology. For MRCs located on the sinus floor, factors with a potential impact on the volume, surface, and diameter were analyzed.

Results

An MRC was present in 130 (28.6%) of the 454 sinuses. Most MRCs were located on the sinus walls and floor. The mean MRC volume, surface, and diameter were 551.21±1368.04 mm³, 228.09±437.56 mm², and 9.63±5.40 mm, respectively. Significantly more sinuses with associated endodontically treated teeth/periapical lesions were diagnosed with an MRC located on the sinus floor. For MRCs located on the sinus floor, endodontic status exhibited a significant association with increased volume, surface, and diameter.

Conclusion

Periapical lesions might be a contributing factor associated with the presence and volume of MRCs located on the sinus floor. The 3D-Slicer software platform was found to be a useful tool for clinicians to analyze the size of MRCs before surgical interventions such as sinus floor elevation procedures.