Tongue Cysts: Evaluation, Risks & Management

Cysts under the tongue are usually benign but require clinical evaluation to determine type and need for intervention.

Common Types

• Mucous Retention Cyst (Mucocele): Trauma → severed minor salivary duct → mucus extravasation. Fluctuant, translucent, <2 cm. Often recurrent if not excised with gland.
• Dermoid / Epidermoid Cyst: Congenital inclusion of ectodermal elements. Midline, slow-growing.
• Lymphoepithelial Cyst: Benign, lymphoid origin.
• Ranula: Submandibular duct obstruction → floor-of-mouth swelling ("plunging" if extends below mylohyoid).
• Thyroglossal Duct Cyst: Midline, moves with swallowing/tongue protrusion.

Red Flags for Urgent Evaluation

• Rapid growth, fixation, ulceration, bleeding
• Cervical lymphadenopathy
• Pain, dysphagia, airway symptoms
• History of tobacco/alcohol

Diagnostic Steps

1. Clinical exam (inspection, palpation, transillumination)
2. Ultrasound / MRI (characterize, depth, relation to structures)
3. FNA if solid component suspicious
4. Excisional biopsy for definitive diagnosis

Management

• Small, asymptomatic mucoceles: Observe; many rupture/spontaneously resolve.
• Symptomatic/recurrent: Complete excision with associated minor salivary gland (prevents recurrence).
• Ranula: Marsupialization or submandibular gland excision.
• Dermoid/epidermoid: Complete excision (recur if ruptured).

Most are benign. Oral surgeon or ENT evaluation recommended for any persistent floor-of-mouth lesion.