A 23-year-old female nonsmoker with no relevant medical-surgical history or known drug allergies was referred to our hospital.
He came to the consultation due to an increase of volume in the inferior vestibular gingiva adjacent to the left chin orifice, of 2 months of evolution, with active growth.
It was not related to traumatic causes.
Clinical examination revealed a 0.5 cm diameter nodule with fibroelastic consistency, similar to that of the normal mucosa, partially adhered to deep planes.
In the radiological study, no particularities were observed in the lesion area.
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Under local anesthesia, excisional biopsy of the lesion was performed.
The anatomopathological study revealed a proliferation of spindle cells arranged in short rounded cords, with abundant vascular structures of myxomatous appearance, with isolated collagen deposits and foci of extravasated infiltrate.
Immunohistochemical studies were also performed, which were positive for vimentin and muscle actin and negative for alk-protein 1, beta catenin, CD 34, desmin, S-100.
Ki67 expression was 5 to 6% of labeled nuclei.
This picture corresponds to the diagnosis of nodular fasciitis.
A follow-up of 18 months was performed, with no recurrence observed.
