Parotid gland sialolithiasis: a comprehensive systematic review and meta-analysis : Title page

Parotid sialolithiasis represents unique diagnostic and therapeutic challenges due to the anatomy of the gland and the proximity of the facial nerve. The aim of this systematic review and meta-analysis was to evaluate the efficacy and safety of various treatment modalities for parotid gland stones.

A systematic review was conducted in accordance with the PRISMA guidelines. Eligible studies were identified by searching PubMed/MEDLINE, the Cochrane Library, Scopus and Google Scholar. Eligible observational studies and clinical trials reporting on patients with parotid stones were included. The outcomes assessed included stone-free rate, symptom improvement and the presence of any complications. A single-arm random-effects meta-analysis was performed, focusing on endoscopy-only, endoscopy-assisted and extracorporeal shock wave lithotripsy (ESWL). Bias risk was assessed using the Newcastle-Ottawa Scale.

A total of 42 studies involving 1,559 patients were analyzed. Endoscopy-assisted removal showed the highest stone-free rate (93%, 95%CI: 90-96) and symptom improvement (91%, 95%CI: 92-99) (p < 0.05). Combined endoscopic-external approaches were effective for complex stones but had higher complication rates (24%, 95% CI: 14-37). ESWL had a lower stone-free rate (58%) but aided long-term symptom control (p < 0.05). CT-navigation did not significantly enhance clearance (80%). Most complications were minor; no permanent facial nerve injuries were reported. The quality of the evidence was limited by heterogeneity and the lack of any randomized trials.

Endoscopy-assisted and combined approaches offer effective, gland-preserving options for parotid sialolithiasis. ESWL and laser techniques remain adjunctive but warrant further research. Prospective, standardized trials are needed to define any optimal management strategies.