31.4 Reactive Soft Tissue Lesions and the Epulides

Reactive Soft Tissue Epulides

An epulis (plural: epulides) is a non-neoplastic, circumscribed, reactive hyperplastic growth arising from the gingiva or alveolar mucoperiosteum in response to chronic low-grade irritation (calculus, subgingival plaque, overhanging restoration margins, sharp tooth edges, or calculus).

                                   Reactive Gingival Epulides
                                               │
      ┌──────────────────┬─────────────────────┴─────────────────────┬──────────────────┐
      ▼                  ▼                                           ▼                  ▼
Fibrous Epulis      Pyogenic Granuloma                          Peripheral Giant     Pregnancy
(Focal Hyperplasia) • Highly vascular mass                      Cell Granuloma       Epulis
• Pale pink, firm   • Red/purple, bleeds on probe               • Dark purple-blue   • Pyogenic granuloma
• Mature dense      • Lobular capillary haemangioma             • Multinucleated     • 2nd/3rd trimester
  collagen          • Exuberant granulation                       giant cells        • Progesterone-driven
• Low vascularity   • Rapid growth                              • Bone cupping       • Often regresses

1. Fibrous Epulis (Focal Fibrous Hyperplasia / Fibroepithelial Polyp)

• Etiology: The end-stage healing response to chronic mechanical trauma (cheek biting, fractured cusp, calculus). Continued granulation tissue matures into dense fibrous scar tissue.
• Clinical Appearance: Well-circumscribed, pedunculated or sessile nodule on the marginal or interdental gingiva (or buccal mucosa along the occlusal plane as a fibroepithelial polyp). Surface is smooth, firm, non-tender, and pale pink (matching normal mucosa). Does not bleed readily.
• Histology: Overlying hyperorthokeratinised or parakeratinised stratified squamous epithelium covering a dense, hypocellular mass of thick, bundle-forming collagen fibres and mature fibroblasts. Scanty vascularity and minimal chronic inflammatory infiltrate. Metaplastic bone formation (peripheral ossifying fibroma) may occur within the deep fibrous stroma.

2. Pyogenic Granuloma (Pregnancy Epulis / Vascular Epulis)

• Etiology: Exuberant reactive vascular proliferation of granulation tissue in response to minor local irritants. It is a misnomer: it is neither bacterial/pyogenic (produces no pus) nor a true granuloma (contains no granulomatous inflammation).
• Pregnancy Epulis (Granuloma Gravidarum): Develops in approximately 1–5% of pregnant patients, typically during the second or third trimester. Elevated circulating progesterone and estrogen upregulate vascular endothelial growth factor (VEGF), dramatically amplifying vascular responsiveness to subgingival plaque.
• Clinical Appearance: Highly vascular, soft, lobulated or pedunculated mass, bright red to deep purple, often ulcerated on the surface with a fibrinous exudate. Bleeds profusely on gentle probing or mastication.
• Histology: Composed of lobular aggregations of prominent, proliferating, thin-walled capillary-sized blood vessels embedded within an edematous, myxoid fibrous stroma infiltrated by dense neutrophils, lymphocytes, and plasma cells (lobular capillary haemangioma).
• Management: Conservative surgical excision alongside meticulous ultrasonic scaling and root surface debridement. For pregnancy epulides, non-urgent excision should be deferred until postpartum, as many spontaneously regress once hormonal levels normalize.

3. Peripheral Giant Cell Granuloma (PGCG / Giant Cell Epulis)

• Etiology: Reactive lesion arising exclusively from the periosteum or periodontal ligament of the alveolar process, almost certainly triggered by local trauma or extraction socket irritation. Occurs only on tooth-bearing alveolar ridges or edentulous areas anterior to the permanent first molars.
• Clinical Appearance: Sessile or pedunculated, firm, dome-shaped mass with a characteristic dark red, purplish, or slate-blue color (due to vascularity and extensive haemosiderin deposition). Surface may show superficial ulceration.
• Radiographic Hallmark: Intraoral periapical radiographs often demonstrate superficial "cupping" or saucer-shaped external resorption of the underlying alveolar crest cortex beneath the soft tissue mass. (This distinguishes it from fibrous epulides and pyogenic granulomas, which leave cortex intact).
• Histology: Non-encapsulated proliferation of abundant, large, multinucleated osteoclast-like giant cells (containing 5 to 30+ vesicular nuclei) distributed evenly within a background of plump, spindle-shaped mesenchymal stromal cells and sinusoidal blood channels. Characterized by extensive extravasation of red blood cells and abundant brown haemosiderin pigment granules.
• Management: Thorough surgical excision with complete debridement down to underlying bone, curetting the periodontal ligament or periosteum at the base. Recurrence rate is approximately 10% if the deep base is not fully curetted.

Management and the Importance of Removing the Cause

The management principle common to all the reactive lesions is excision with removal of the causative irritant, because a lesion excised while the local cause remains will recur. That means scaling and root surface debridement of the adjacent teeth, smoothing a sharp cusp or restoration margin, easing an overextended denture flange, and reviewing plaque control. Every excised specimen is sent for histopathological examination, without exception: the clinical diagnosis of an epulis is a provisional one, and squamous cell carcinoma, lymphoma and metastatic deposits can all masquerade as a benign reactive swelling.

Specific Cautions

Two lesions carry additional examinable cautions. A pregnancy epulis is a pyogenic granuloma driven by hormonal change and exaggerated response to plaque; it is managed conservatively with meticulous plaque control during pregnancy, with excision deferred until after delivery unless it is bleeding heavily, ulcerated or interfering with function, because recurrence during pregnancy is likely. A peripheral giant cell granuloma must prompt the clinician to exclude hyperparathyroidism, because a brown tumour is histologically indistinguishable; serum calcium, phosphate, alkaline phosphatase and parathyroid hormone should be checked. Peripheral giant cell granuloma also requires excision down to the periosteum with curettage of the underlying bone, since superficial excision leaves it prone to recurrence.