Spindle cell lipoma is a benign lipomatous tumour that mainly occurs in the subcutis of the head, neck, and shoulder in elderly men. Oral spindle cell lipoma is extremely rare in all species, and no cases have been reported in veterinary medicine. A 10-year-old male Maltese dog was presented for evaluation of a whiteto cream-coloured gingival mass. Microscopically, the mass was composed of mature fat cells and spindle cells containing thick fibrocollagenous bundles. The neoplastic cells showed positive immunoreactivity to vimentin and CD34. Based on the clinical and histopathological findings, spindle cell lipoma of the gingiva was diagnosed. Further immunohistochemical analysis revealed that both adipocytes and spindle cells exhibited positive reactions to oestrogen receptors α and β. These findings demonstrate the clinical, morphological, and immunohistochemical characteristics of an oral spindle cell tumour. The potential role of sex steroid hormones in the pathogenesis of this tumour is also discussed.
Rhabdoid tumours (RTs) are rare, highly aggressive tumours of undetermined origin in humans, and are sub-classified as renal/extrarenal RTs depending on location. The origins of extrarenal rhabdoid tumours are an enigma and neoplasms have rarely been reported in non-primate species. An 11-year-old male Maltese dog was presented with a submandibular mass. Histologically, the mass was composed of sheets of highly pleomorphic "rhabdoid" cells, further characterised by the presence of large epithelioid cells with globular/fibrillar paranuclear inclusions. Further immunohistochemical analysis revealed that the neoplastic cells were positive for vimentin and desmin similar to human tumours. In addition, ultrastructural analysis showed that the intracytoplasmic inclusions were mainly composed of whorled bundles of intermediate filaments. Our results suggest a useful diagnostic approach to cutaneous, extrarenal rhabdoid tumours in dogs and describe their characteristics.
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