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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)