PMC9363213_01
Intraoral clinical findings and imaging findings of the 76-year-old female patient. (a) A whitish-colored submucosal mass covered with normal mucosa was observed on the mucosal aspect of the right lower lip. The dotted line indicates the extent of the lesion. This lesion was 5 mm in max. Dia. and was clinically diagnosed as a benign tumor. (b) Dental panoramic radiography provided no significant findings that seemed to be associated with the mass.
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An intraoral clinical examination revealed a nonmovable asymptomatic submucosal nodule ~5 mm in diameter on the right side of the lower lip (Figure 1(a)). Dental panoramic radiography provided little useful information (Figure 1(b)).
Histological findings. (a) Low-power image. The lesion consisted of an abscess formation with a basophilic bacterial colony contained within a dilated salivary gland duct. Squamous epithelium with little reactive cell atypia covering them was observed. Scale bar: 20 mum. (b) High-power image. The central bacterial colony was characterized by peripheral eosinophilic club-like structures with calcification (arrows) and surrounded by inflammatory cells including neutrophils. Scale bar: 200 mum.
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Low-power microscopy revealed the bacterial colony within a dilated salivary gland duct in a submucosal area which was covered by non-atypical squamous epithelium (Figure 2(a)). In the high-power view, the colony consisted of a central mass of bacteria surrounded by an eosinophilic club-like structure arranged in radiating rosette pattern with calcification and a dense infiltration of inflammatory cells including neutrophils (Figure 2(b)).