목적: Palpable submandibular hilar sialoliths can be removed transorally with or without sialendoscopy. However, nonpalpable hilar or deeper intraglandular stones remain a surgical challenge even with sialendoscopy if they are inaccessible or impacted in post-hilar and intraparenchymal regions. 방법:We retrospectively evaluated the efficacy of the sialendoscopic approach for retrieving nonpalpable submandibular stones located in the hilum or deeper parenchyma. The characteristics of sialoliths, such as the longest diameter, number (single vs. multiple), location (hilar vs. intraparenchymal; deep lobe vs. superficial lobe), mobility (mobile vs. impacted), and accessibility (visible vs. non-visible), were evaluated. Outcomes include the success rate, operation time, complication rate, recurrence, and function recovery. We compared the outcomes with nonendoscopic transoral stone removal, which was traditionally conducted before the equipment of the sialendoscope. 결과:Sialendoscopy-assisted stone removal (SASR) was performed on 71 patients (77.17%), while non-endoscopic transoral stone removal (TOSR) was attempted on 21 patients (22.83%). The stones in SASR patients were smaller in size compared to those in TOSR patients. On average, SASR patients had 1.17 stones, while TOSR patients had 1.05 stones. In SASR, the stones were completely retrieved in 69 glands (97.18%), although SASR failed to retrieve sialoliths located in intraparenchymal or superficial lobes and less than 2 mm in size. TOSR was conducted only in hilar stones; nevertheless, the overall success rate was 90.48% (19 out of 21 glands), and was lower than that of SASR. Additionally, SASR patients experienced significantly less bleeding than TOSR patients. Complications such as lingual nerve numbness and ranula occurred more frequently in TOSR patients (38.1%) than in SASR patients (7.04%). Finally, the recovery of gland function was observed in 72.72% of SASR patients. 결론:These results suggest that SASR remains useful for retrieving nonpalpable hilar or intraparenchymal submandibular stones. The precise assessment of the location is mandatory before surgical intervention in nonpalpable submandibular sialoliths.