Abstract

CEA-ARESTIN, Pablo; BILBAO-ALONSO, Arturo; ANTUNEZ-LOPEZ, José Ramón  and  SEOANE-LESTON, Juan. Glomus tumour of the masticatory space mimicking oral mandibular pathology. Rev Esp Cirug Oral y Maxilofac [online]. 2023, vol.45, n.2, pp.88-93.  Epub Nov 20, 2023. ISSN 2173-9161.  https://dx.doi.org/10.20986/recom.2023.1457/2023.

Glomus tumour is a mesenchymal neoplasm from modified smooth muscle cell of the glomus apparatus. Only 39 cases have been reported in the oral cavity. A 32-year-old female presented with intense pain and hypoaestesia in the mandibular nerve area. Oral physical examination revealed a soft bulging tender to palpation. Orthopantomography showed a radiolucent, well-defined image in the mandibular ramus suggesting an osseous disorder. However, CT and angio-CT showed a hypervascular lesion in the right masticatory space. An intraoral surgical approach to the lesion was chosen. Histopathological analysis showed diffuse and strong positivity for vimentin. Smooth muscle actin, muscle specific actin, and smooth muscle myosin heavy-chain were also positive, but immunoreactivity for markers varied in extension and intensity between different tumour areas. Calponin showed focal and weak immunostaning. Proliferation index (Ki67-MIB1) was less than 1 %.

Based on these morphological and immunohistochemical findings, the tumour was diagnosed as a glomus tumour (solid type). This first description of a glomus tumour in the masticatory space makes us include it in the differential diagnosis of neoplasms in this area.

Keywords : Glomus tumour; head and neck neoplasms; case report.

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