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Oral & Dental Health

Oral Trauma - Mucocele / Ranula

A swelling caused by extravasation (leakage) of saliva into surrounding soft tissues due to damage or obstruction of a minor salivary gland duct (Mucocele) or sublingual gland duct (Ranula). Not a true cyst as lacks epithelial lining.

Also known as: Mucous Cyst, Salivary Extravasation Cyst

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Referral and warning signs

When to refer

Refer all Mucoceles and Ranulas to Dental/Oral Surgery/ENT service (HC4+/RR) for surgical management.

Red flags

  • Rapidly enlarging swelling.
  • Associated hardness or fixation (suspicious for tumour).
  • Neck swelling associated with floor of mouth swelling (plunging ranula).

Signs and symptoms

  • Mucocele:
  • - Soft, fluctuant, dome-shaped swelling.
  • - Often bluish or translucent appearance.
  • - Most common site: Lower lip.
  • - Other sites: Buccal mucosa, ventral tongue, floor of mouth.
  • - Usually painless.
  • - May fluctuate in size, can rupture spontaneously releasing viscous fluid, often recurs.
  • Ranula:
  • - Mucocele specifically arising from sublingual gland in the floor of the mouth.
  • - Larger, bluish, translucent swelling in floor of mouth, lateral to midline.
  • - May elevate the tongue.
  • - 'Plunging Ranula': If saliva dissects through mylohyoid muscle into the neck, causing a neck swelling.

Risk factors

  • Trauma to minor salivary gland ducts (lip biting, accidental bite, dental procedures).
  • Obstruction of salivary duct (e.g., small salivary stone - sialolith - less common for minor glands).

Diagnosis

Clinical assessment

Based on characteristic clinical appearance (soft, fluctuant, bluish/translucent swelling) and location (lower lip for mucocele, floor of mouth for ranula). History of trauma or fluctuation in size.

Differential diagnosis

  • Haemangioma / Vascular malformation.
  • Lipoma.
  • Fibroepithelial polyp (firmer, pink).
  • Salivary gland tumour.
  • Lymphangioma.
  • Dermoid/Epidermoid cyst (floor of mouth).

Investigations

  • Clinical examination usually sufficient.
  • Aspiration may yield viscous, mucoid fluid (confirmatory but not usually needed).
  • Imaging (Ultrasound, CT/MRI): May be used for large ranulas or plunging ranulas to assess extent.
  • Excisional Biopsy with histology confirms diagnosis.

Diagnostic criteria

Clinical appearance +/- aspiration findings +/- histology confirmation.

Management

Surgical Management

  • Mucocele: Surgical excision including the associated minor salivary gland(s) to prevent recurrence. (LOC: HC4+/RR - Dental/Oral Surgery)
  • Ranula:
  • - Marsupialization (creating an opening/pouch).
  • - Excision of the sublingual gland (more definitive, lower recurrence). (LOC: RR - Oral/Maxillofacial Surgery/ENT)
  • - Management of plunging ranula requires neck approach.

Monitoring

Monitor for recurrence after surgical treatment.

Complications

  • Recurrence (if associated gland not removed or duct reforms).
  • Infection (rare).
  • Damage to adjacent structures during surgery (e.g., lingual nerve for ranula).

Prevention

  • Avoid lip/cheek biting habits.

Patient education

  • Explanation of the condition (blocked/damaged saliva gland duct).
  • Benign nature.
  • Need for surgical removal to prevent recurrence.
  • Surgical procedure options and potential risks.
  • Signs of recurrence.

Uganda-specific notes

Common lesions. Require referral for surgical excision.

References

  • Uganda Clinical Guidelines (UCG) 2023

    Chapter 23, Section 23.4.1 (Mucocele, Ranula)

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