A ranula is a mucus-filled lesion of the floor of the mouth, usually caused by mucus extravasation from the sublingual gland.
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Ranulas may remain localized to the floor of the mouth (oral ranula) or extend through the mylohyoid muscle into the neck, producing a plunging ranula. Accurate clinical assessment is essential because the extent of the lesion influences diagnosis and treatment.
✅ What Is a Ranula?
A ranula is generally considered a pseudocyst, because it is produced by mucus accumulation in connective tissue rather than by a true epithelial-lined cyst.
The lesion most commonly originates from the sublingual gland. Trauma or obstruction affecting the gland or its ducts may result in mucus leakage into the surrounding tissues.
In children, ranulas are usually painless, soft or fluctuant, and bluish or translucent, although their appearance can vary according to the depth and size of the lesion.
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The most characteristic presentation is a unilateral swelling in the floor of the mouth, usually lateral to the midline.
Common findings include:
▪️ Painless, fluctuant swelling
▪️ Bluish or translucent appearance when superficial
▪️ Variable size
▪️ Possible elevation or displacement of the tongue
▪️ Intermittent enlargement and reduction
▪️ Difficulty with speech, mastication, or swallowing when large
A plunging ranula may present primarily as a painless swelling in the submandibular or upper cervical region, sometimes with little or no obvious intraoral component.
Rarely, a large lesion can compromise the airway, making prompt assessment particularly important.
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Diagnosis is primarily based on the clinical examination. However, imaging is useful when the lesion is large, atypical, recurrent, or suspected to extend beyond the floor of the mouth.
Ultrasonography is a useful first-line imaging technique because it can help evaluate the relationship between the lesion, sublingual gland, and surrounding structures. MRI or CT may be considered when deeper extension needs to be defined.
Fine-needle aspiration may demonstrate mucus and can assist in selected cases, particularly when the diagnosis is uncertain. However, it should not replace appropriate clinical and imaging assessment.
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The differential diagnosis of a pediatric floor-of-mouth swelling may include:
▪️ Mucocele
▪️ Dermoid or epidermoid cyst
▪️ Lymphatic malformation
▪️ Salivary gland lesions
▪️ Vascular malformation
▪️ Congenital or developmental cysts
▪️ Abscess or other inflammatory lesions
The presence of a fluctuant, bluish lesion in the floor of the mouth is suggestive of a ranula, but atypical lesions require further investigation.
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The distinction is clinically important.
Oral ranula remains predominantly within the floor of the mouth.
Plunging ranula extends beyond the floor of the mouth, usually through or around the mylohyoid muscle, and may produce a cervical swelling.
A pediatric retrospective study and literature review found that conservative approaches were associated with higher recurrence, whereas treatment involving removal of the ipsilateral sublingual gland produced favorable long-term outcomes, particularly for plunging ranulas.
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Management should be individualized according to age, symptoms, lesion size, recurrence, and anatomical extension.
1. Observation
Small and asymptomatic lesions may be initially observed because spontaneous resolution can occur, particularly in young children. However, there is no universally accepted observation period, and the evidence is based largely on retrospective studies and case series.
2. Marsupialization
Marsupialization creates an opening that allows the accumulated mucus to drain into the oral cavity.
It is less invasive than gland excision but has historically been associated with higher recurrence rates, particularly when used as definitive treatment without addressing the underlying sublingual gland.
3. Sublingual Gland Excision
Removal of the affected sublingual gland, with or without removal of the pseudocyst component, has demonstrated the lowest recurrence rates in several clinical series.
A 2025 systematic review and meta-analysis including hundreds of ranulas found that sublingual gland resection had the highest treatment success, supporting its role as the standard definitive surgical approach.
For pediatric plunging ranulas, intraoral removal of the ipsilateral sublingual gland has also demonstrated favorable outcomes with low morbidity in published series.
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The management of pediatric ranula remains an area in which the quality of evidence is limited. Much of the literature consists of retrospective studies, case series, and small clinical cohorts rather than randomized controlled trials. A systematic review specifically addressing pediatric oral ranula concluded that there was insufficient high-quality evidence to establish a single universally superior treatment protocol.
Nevertheless, the evidence has become more consistent regarding recurrence. Procedures that address only the accumulated mucus or pseudocyst tend to have a greater risk of recurrence than procedures that address the affected sublingual gland.
This distinction is particularly relevant for pediatric dentists. A ranula should not simply be considered another type of mucocele. Localization, cervical extension, recurrence, and symptoms should guide referral and treatment planning.
✍️ Conclusion
Ranula is an uncommon but clinically important lesion in pediatric dentistry. Most lesions present as painless swelling of the floor of the mouth, while plunging ranulas may appear primarily as cervical masses.
Clinical examination is fundamental, with ultrasound and additional imaging used when anatomical extension or diagnostic uncertainty exists. Observation may be appropriate for selected small, asymptomatic lesions, but recurrent or symptomatic ranulas frequently require surgical management.
Current evidence increasingly supports ipsilateral sublingual gland excision as the most predictable definitive treatment, particularly for recurrent or plunging ranulas, although treatment should be individualized according to the child's clinical circumstances.
🎯 Clinical Recommendations
▪️ Refer suspected ranulas for appropriate oral and maxillofacial evaluation, particularly when the lesion is large, recurrent, or associated with cervical swelling.
▪️ Use ultrasonography when the diagnosis or anatomical extent is uncertain.
▪️ Do not assume that simple drainage or aspiration provides definitive treatment; recurrence is a major consideration.
▪️ For recurrent or plunging lesions, discuss treatment options that address the ipsilateral sublingual gland.
▪️ Urgently evaluate lesions associated with dysphagia, significant tongue displacement, respiratory symptoms, or rapid enlargement.
📚 References
✔ Chatterjee, A., Sengupta, S., & Ghosh, S. (2017). Management of paediatric oral ranula: A systematic review. Journal of Clinical and Diagnostic Research, 11(9), ZE01–ZE05. https://doi.org/10.7860/JCDR/2017/28088.10571
✔ Zhi, K., Wen, Y., & Zhou, H. (2009). Management of the pediatric plunging ranula: Results of 15 years' clinical experience. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 107(4), 499–502. https://doi.org/10.1016/j.tripleo.2008.09.023
✔ Seo, J. H., Park, J. P., Kim, H. Y., Jeon, S. Y., Kim, J. P., Ahn, S. K., Hur, D. G., Kim, D. W., & Lee, J. S. (2010). Surgical management of intraoral ranulas in children: An analysis of 17 pediatric cases. International Journal of Pediatric Otorhinolaryngology, 74(2), 202–205. https://doi.org/10.1016/j.ijporl.2009.11.011
✔ Zhi, K., Gao, L., & Ren, W. (2014). What is new in management of pediatric ranula? Current Opinion in Otolaryngology & Head and Neck Surgery, 22(6), 525–529. https://doi.org/10.1097/MOO.0000000000000103
✔ Sigismund, P. E., Bozzato, A., Schumann, M., Koch, M., Iro, H., & Zenk, J. (2013). Management of ranula: 9 years' clinical experience in pediatric and adult patients. Journal of Oral and Maxillofacial Surgery, 71(3), 538–544. https://doi.org/10.1016/j.joms.2012.07.042
✔ Zhi, K., Wen, Y., Zhou, H., Ren, W., & Zhang, Y. (2008). Management of infant ranula. International Journal of Pediatric Otorhinolaryngology, 72(6), 823–826. https://doi.org/10.1016/j.ijporl.2008.02.012
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