Swellings of the Jaw - Differential Diagnosis and Treatment

Classification Overview

Swellings of the Jaw
├── 1. Inflammatory / Infective
├── 2. Odontogenic Cysts
│   ├── Developmental
│   └── Inflammatory
├── 3. Non-Odontogenic Cysts
├── 4. Non-Epithelial (Pseudocysts)
├── 5. Odontogenic Tumors (Benign)
├── 6. Fibro-Osseous Lesions
├── 7. Giant Cell Lesions
├── 8. Malignant Tumors (Primary & Secondary)
└── 9. Soft Tissue / Mucosal Swellings

1. Inflammatory / Infective Swellings

Dental Abscess / Periapical Abscess

• Pathology: Bacterial infection from a non-vital (pulp-necrotic) tooth spreading through the apical foramen into the alveolar bone
• Features: Acute onset, tender, fluctuant swelling; tooth non-vital to electric pulp test; fever, malaise
• Radiology: Periapical radiolucency on OPG/periapical X-ray
• Treatment:
  • Drainage (incision and drainage if fluctuant)
  • Root canal treatment (RCT) or tooth extraction
  • Antibiotics (amoxicillin 500 mg TDS or metronidazole) if systemic signs present

Osteomyelitis

• Acute: Severe throbbing pain, swelling, high fever, trismus, pus discharge; associated non-vital teeth
• Chronic / Primary Chronic Osteomyelitis: Insidious jaw swelling, normal overlying mucosa, no fever, no leukocytosis; "onion-skin" periosteal reaction on imaging; peaks in childhood/adolescence and after age 50
• Treatment: Acute - IV antibiotics (penicillin-based), surgical debridement; Chronic - long-course antibiotics, sequestrectomy, hyperbaric oxygen in refractory cases

Cellulitis / Fascial Space Infections

• Ludwig's angina (bilateral submandibular/sublingual space infection) - life-threatening
• Treatment: Airway protection, IV antibiotics, surgical drainage

2. Odontogenic Cysts

A. Developmental Odontogenic Cysts

Dentigerous (Follicular) Cyst

• Most common developmental odontogenic cyst
• Arises from reduced enamel epithelium; envelops the crown of an unerupted tooth, attached at the cemento-enamel junction
• Most commonly involves mandibular third molars and maxillary canines
• Radiology: Well-defined radiolucency around the crown of an impacted tooth
• Treatment: Enucleation + extraction of involved tooth; marsupialization for large cysts in children to allow eruption

Bilateral dentigerous cysts on OPG - Scott-Brown's Otorhinolaryngology

Odontogenic Keratocyst (OKC) / Keratocystic Odontogenic Tumour (KCOT)

• Peak incidence 20-30 years; mandible:maxilla ratio 2:1
• Arises from rests of Serres (dental lamina)
• Features: Usually asymptomatic jaw enlargement; may be detected incidentally on OPG
• Radiology: Unilocular or multilocular radiolucency with well-defined sclerotic margins; tendency to grow anteroposteriorly within the medullary cavity without bony expansion
• Treatment: Surgical excision; adjunctive methods to reduce recurrence - peripheral ostectomy, Carnoy's solution application, cryotherapy; enucleation alone has ~30% recurrence; associated with Gorlin-Goltz syndrome (multiple OKCs + basal cell carcinomas + calcified falx cerebri)

Lateral Periodontal Cyst

• Arises from rests of Serres lateral to the root of a vital tooth
• Treatment: Enucleation; botryoid variant (multilocular) has higher recurrence

Glandular Odontogenic Cyst (Sialo-Odontogenic Cyst)

• Rare; lined by epithelium containing mucous cells resembling salivary gland tissue
• More aggressive behavior; higher recurrence rate
• Treatment: Wide surgical excision with margins

B. Inflammatory Odontogenic Cysts

Radicular (Periapical / Dental) Cyst

• Most common cyst of the jaws overall
• Arises from rests of Malassez stimulated by infection at the root apex of a non-vital tooth
• Radiology: Periapical radiolucency, usually <2 cm, well-defined
• Treatment: Root canal treatment often leads to resolution; enucleation if persistent; tooth extraction + curettage

Residual Cyst

• Radicular cyst that persists after tooth extraction
• Treatment: Surgical enucleation

Paradental Cyst

• Lateral to the crown of a partially erupted mandibular third molar
• Treatment: Enucleation + extraction of the associated tooth

3. Non-Odontogenic Cysts

Nasopalatine Duct Cyst (Incisive Canal Cyst)

• Most common non-odontogenic cyst
• Arises from embryological remnants of the nasopalatine duct in the incisive canal
• Features: Asymptomatic swelling of the anterior hard palate/nasopalatine papilla; adjacent teeth remain vital
• Radiology: Heart-shaped or oval radiolucency in the midline of the anterior maxilla
• Treatment: Surgical enucleation

Nasolabial (Nasoalveolar) Cyst

• Soft tissue cyst; lateral to midline; arises from remnants of nasolacrimal duct
• Treatment: Surgical excision

Median Palatal / Median Mandibular Cyst

• Rare; arise along lines of fusion
• Treatment: Enucleation

Dermoid / Epidermoid Cyst

• Entrapped epithelium at embryonic lines of closure
• Presents as sublingual/submental swelling in the floor of mouth
• Treatment: Surgical excision

4. Non-Epithelial Bone Cysts (Pseudocysts)

Solitary (Simple / Traumatic) Bone Cyst

• Not a true cyst - no epithelial lining; empty or serosanguinous fluid-filled cavity
• Young patients; mandible; often asymptomatic; vital teeth
• Radiology: Radiolucency with scalloped margins between tooth roots
• Treatment: Surgical exploration - opening the cavity to promote bleeding and healing is often curative

Aneurysmal Bone Cyst

• Not a true cyst; presents in mandible of children/young adults; rapid growth
• Radiology: Unilocular/multilocular radiolucency; scalloped margins; blood-filled spaces on MRI
• Treatment: Curettage or excision; may heal spontaneously after biopsy

Stafne's Idiopathic Bone Cavity

• An asymptomatic, below-the-inferior-alveolar-canal radiolucency in the posterior mandible; actually a lingual cortical defect containing salivary gland tissue
• Treatment: None required; biopsy/follow-up to confirm

5. Odontogenic Tumors (Benign)

Ameloblastoma

• Most common clinically significant odontogenic tumor
• Locally aggressive, infiltrative into bone marrow; multicystic or unicystic
• Features: Asymptomatic early; later - extensive jaw expansion and facial deformity; can cause tooth displacement/loosening
• Radiology: "Soap bubble" multilocular radiolucency; can be unilocular; mandible >> maxilla (80%)
• Treatment:
  • Unicystic: Enucleation + curettage (with risk of recurrence ~15-30%)
  • Multicystic/solid: Resection with 1-1.5 cm bony margins; immediate reconstruction with bone grafts/implants
  • Maxillary ameloblastoma: Often needs more radical resection due to proximity to skull base

Adenomatoid Odontogenic Tumor (AOT)

• Also called "adenoameloblastoma"; predominantly in young females; follicular (73%), extra-follicular, peripheral variants
• Associated with unerupted tooth (usually canine)
• Features: Painless, slow-growing swelling
• Treatment: Enucleation - excellent prognosis, rarely recurs

Odontoma

• Most common odontogenic tumor; hamartomatous rather than true neoplasm
• Complex odontoma: Disorganized mass of dental hard tissue; posterior jaws
• Compound odontoma: Multiple small tooth-like structures; anterior maxilla
• Treatment: Surgical excision (conservative); excellent prognosis

Cementoma / Cementifying Fibroma / Cemento-Ossifying Fibroma

• Benign; mesenchymal origin; slow-growing, painless
• Treatment: Surgical excision; recurrence rate low for cemento-ossifying fibroma

Myxoma (Odontogenic Myxoma)

• Locally aggressive; myxoid tissue in jaw bone; gelatinous appearance
• Radiology: "Tennis racket" or multilocular radiolucency
• Treatment: Resection with margins (high recurrence with curettage alone)

Calcifying Epithelial Odontogenic Tumor (CEOT / Pindborg Tumor)

• Rare; locally aggressive; mandible; calcified Liesegang ring deposits on histology
• Radiology: "Driven snow" calcifications mixed with radiolucency
• Treatment: Resection with margins

6. Fibro-Osseous Lesions

Fibrous Dysplasia

• Most common fibro-osseous lesion of the jaw; usually under age 20
• Monostotic (most common) - localized; affects maxilla more often
• Polyostotic - rare; Albright's syndrome (café-au-lait spots + precocious puberty)
• Features: Painless, smooth, rounded swelling; may cause malocclusion by displacing teeth; growth typically ceases at skeletal maturity
• Radiology: "Ground glass" appearance; poorly defined border blending into normal bone
• Treatment: Observation until skeletal maturity; surgical recontouring for cosmetic/functional deformity; no excision needed as margins poorly defined

Ossifying Fibroma

• Well-defined margins (distinguishes from fibrous dysplasia); mandible more common
• Juvenile aggressive ossifying fibroma - seen in pediatric patients; high recurrence
• Treatment: Surgical excision (conservative); juvenile variant - wide excision due to recurrence risk

Paget's Disease of Bone (Osteitis Deformans)

• Older patients; maxilla more commonly affected (jaw enlargement causing denture problems)
• Elevated ALP; "cotton wool" radiological appearance
• Treatment: Bisphosphonates (zoledronate, alendronate); calcitonin for pain

Cemento-Osseous Dysplasia

• Primarily periapical; teeth remain vital; rarely presents as jaw swelling
• Treatment: Usually none required; observe

7. Giant Cell Lesions

Central Giant Cell Granuloma (CGCG)

• Benign but locally aggressive; mandible of young females; anterior to first molars
• Radiology: Multilocular radiolucency; may cause root resorption
• Treatment: Curettage; intralesional corticosteroids; calcitonin spray; subcutaneous interferon alfa-2a; resection for aggressive variants
• Note: Must be distinguished from giant cell tumor of bone, hyperparathyroidism (brown tumor), Cherubism, and aneurysmal bone cyst

Cherubism

• Autosomal dominant; bilateral giant cell lesions of the mandible (and sometimes maxilla)
• Angel/cherub-like facies due to bilateral jaw expansion
• Treatment: Observation (often self-limiting at puberty); surgical recontouring if severe

8. Malignant Tumors

Primary Malignant Tumors of the Jaw

Secondary (Metastatic) Tumors to the Jaw

• Jaw metastases most commonly from: breast, lung, prostate, kidney, thyroid, colon
• Mandible > maxilla (80% posterior mandible)
• Features: Pain, paresthesia of lip/chin (Vincent's symptom), tooth mobility
• Treatment: Palliative; primary tumor management; local radiotherapy; bisphosphonates

Squamous Cell Carcinoma (SCC) of the Jaw

• Usually arises from overlying gingival/alveolar mucosa and invades bone secondarily
• Treatment: Hemimandibulectomy/maxillectomy + neck dissection + post-operative radiotherapy

9. Soft Tissue / Mucosal Swellings

Investigations for Any Jaw Swelling

1. OPG (Orthopantomogram) - first-line imaging for all jaw pathology
2. CT scan (with contrast) - extent, bony destruction, relationship to structures
3. MRI - soft tissue involvement, marrow infiltration
4. Biopsy - mandatory for all tumors/cysts; incisional biopsy first for suspected malignancy
5. Blood tests - FBC, ESR, CRP, ALP (Paget's), serum calcium/PTH (brown tumor), serum protein electrophoresis (myeloma)
6. Aspiration - yellow keratin content = OKC; straw-colored fluid = other cyst; blood = vascular lesion/aneurysmal bone cyst; negative = traumatic bone cyst

Key Diagnostic Mnemonics

• "VINDICATE" - Vascular, Inflammatory, Neoplastic, Degenerative, Idiopathic, Congenital, Autoimmune, Traumatic, Endocrine
• Periapical radiolucency with non-vital tooth → radicular cyst or periapical abscess
• Radiolucency with impacted tooth crown → dentigerous cyst
• Multilocular "soap bubble" → ameloblastoma, central giant cell granuloma, OKC
• Ground glass appearance → fibrous dysplasia
• "Sunburst" periosteal reaction → osteosarcoma
• Multiple punched-out lesions → multiple myeloma, metastases, Langerhans cell histiocytosis

• Scott-Brown's Otorhinolaryngology Head & Neck Surgery, Chapter 25 - Cysts of the Jaws (p. 443-445)
• Cummings Otolaryngology Head and Neck Surgery - Odontogenic Cysts and Tumors (Block 18-19)
• RACGP AJGP - Common causes of swelling in the oral cavity
• Mayo Clinic - Jaw tumors and cysts: Diagnosis and treatment