Congenital epulis, also known as congenital granular cell tumour, congenital gingival cell tumour, or Neumann’s tumour, is a rare, benign soft‑tissue neoplasm that arises on the oral mucosa of newborn infants. It most commonly presents as a pedunculated or sessile nodule on the gingiva of the anterior maxillary alveolar ridge, although lesions may also occur on the mandibular alveolar ridge or, rarely, the tongue. The tumour is composed of large polygonal cells with abundant eosinophilic granular cytoplasm and a thin overlying layer of stratified squamous epithelium.
Epidemiology
- Incidence is approximately 0.0006 % of live births.
- Fewer than 300 cases have been reported in the literature.
- A strong female predominance is observed, with reported female‑to‑male ratios ranging from 9:1 to 10:1.
- Approximately three‑quarters of cases involve the maxilla; the mandible is affected in about one‑quarter of cases.
- Most lesions are solitary; multiple lesions occur in roughly 10 % of reported cases.
Clinical presentation
- Typically identified at birth as a smooth, pink‑to‑red, firm nodule ranging from a few millimetres to up to 7–10 cm in diameter.
- Small lesions may be asymptomatic. Larger masses can interfere with feeding, cause oral obstruction, or, in extreme cases, produce respiratory distress.
- The lesion is usually well‑circumscribed and may be covered by intact mucosa; ulceration can occur if the mass is traumatized.
Pathogenesis
The precise origin of congenital epulis remains uncertain. Proposed mechanisms include:
- Derivation from odontogenic (tooth‑forming) tissue or dental papilla.
- Developmental abnormality of the tooth‑forming apparatus.
- Mesenchymal differentiation with features of fibroblasts or histiocytes.
- Possible hormonal influence, suggested by the marked female predominance, although estrogen and progesterone receptors have not been consistently demonstrated.
Histopathology
- The lamina propria is replaced by sheets or nests of large, round to oval cells with centrally placed nuclei and abundant granular eosinophilic cytoplasm.
- Cells are often separated from the overlying epithelium by a thin fibrous band.
- Immunohistochemistry typically shows positivity for vimentin and CD68, supporting a mesenchymal lineage, while S‑100 protein is usually negative, distinguishing it from adult granular cell tumours.
Diagnosis
- Clinical examination and imaging (ultrasound or MRI) can delineate the size and extent of the mass.
- Definitive diagnosis is made by histopathologic examination of an excised specimen.
- Prenatal ultrasonography may detect larger lesions in the third trimester, allowing for perinatal planning.
Management
- Surgical excision is the treatment of choice and is usually curative.
- Simple excision, even without wide margins, is sufficient because the tumour is benign and lacks infiltrative growth.
- In small, asymptomatic lesions, a period of observation may be considered, as spontaneous regression has been reported in rare cases.
- Post‑operative complications are uncommon; recurrence is exceedingly rare.
Prognosis
- Prognosis is excellent following complete removal.
- No malignant transformation has been documented.
- Long‑term follow‑up is generally limited to monitoring for rare recurrence or functional issues related to scar tissue.
References
Information compiled from peer‑reviewed medical literature and reputable online medical resources, including the Wikipedia entry on congenital epulis (accessed via a public domain mirror) and related articles indexed in PubMed Central.