Abstract
The spontaneous occurrence of mandibular odontogenic fibrosarcoma is reported in pickhandle barracuda (Sphyraena jello) from Parangipettai fish landing centre, southeast coast of India. The gross morphology revealed reddish-white, fleshy distended tumours in and around the intraoral bone musculature. The necropsy examination showed no gross evidence of local invasion and distant metastasis into visceral organs. Histopathologically, tumours were characterized by abundant hyperplastic small spindle cells arranged into well-defined interwoven bundles. The spindle cells presented scant fibrillar cytoplasm, and oval to elongated hyperchromatic and pleomorphic nuclei. The ultrastructure of mandibular lesions was composed of differentiated fibroblasts with nuclei enveloped by a thin rim of cytoplasm with denser heterochromatin and lighter euchromatin. Mitotic figures were seen in high numbers of cells, telophase of the karyokinesis was observed. No virus particles were observed in the examined lesions. Based on the histological and ultra-structural findings, this tumour was diagnosed as mandibular odontogenic fibrosarcoma in S. jello.
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