Conclusion: High-frequency ultrasound is without harm and has high efficiency, it is an important method for the diagnosis of plunge ranula.

结论：超声是诊断潜突型舌下腺囊肿的重要辅助手段，其方法高效无创并对临床诊治具有重要的指导意义。

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Conclusion: High-frequency ultrasound is without harm and has high efficiency, it is an important method for the diagnosis of plunge ranula.

结论：超声是诊断潜突型舌下腺囊肿的重要辅助手段，其方法高效无创并对临床诊治具有重要的指导意义。

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