Cysts of the soft tissues

• Epidermoid cyst
• Rare
• May manifest during infancy or childhood
• Most commonly midline of FOM
• Treatment with enucleation, recurrences are rare
• Heterotropic gastrointestinal cyst
• Extremely rare
• Usually present at birth or soon after
• Cystic swelling in the anterior floor of mouth
• Enucleation, rare recurrence
• Lymphoepithelial cyst (Oral tonsil)
• Rare
• Any age 
• Yellowing, circumscribed swelling, asymptomatic
• Floor of mouth and ventral tongue
• Nasolabial cyst
• Rare
• Mainly diagnosed during adulthood
• Paramedian swelling in the upper mucobuccal fold. May show some radiographic erosion. May see swelling of nasolabial groove and bluish swelling intranasally
• Enucleation through an intraoral approach
• Mucous retention phenomenon (Mucocele, Ranula)
• Traumatic obstruction of the duct
• Common, any age
• Bluish, non painful, recurre
• Mainly Lower lip (Mucocele) or floor of mouth (Ranula) involving the sublingual gland
• Plunging ranula herniates through the mylohyoid muscle presenting as a submental or submandibular swelling. 
• Lower lip enucleation
• Ranula marsupualisation. If recurrence, removal of the sublingual gland may be indicated
• Plunging ranula, removal of the gland should resolve the issue
• Thyroglossal duct cyst
• Rare, usually manifests during childhood
• Any site along the thyroglossal tract: Extraorally in the neck midline or intraorally in the foramen caecum (Posterior of the median sulcus of the tongue dorsum) or tongue dorsum
• Enucleation, may need to include portion of the hyoid bone to prevent recurrence