Canine low‐grade intra‐orbital myxosarcoma: case report

Objective The aim of this study was to evaluate important clinical, morphological, histopathological, histochemical, and immunohistochemical characteristics in order to establish the diagnosis and prognosis of a low‐grade intra‐orbital myxosarcoma. Animal studied A mongrel dog presented a 2‐year history of a neoplastic mass behind the right eye. Results The neoplasm presented a mesenchymal spindle and stellate cell proliferation with an abundant myxoid matrix, moderate anisocariosis, and a low mitotic index. It stained positive for vimentin, moderately positive for p eriodic acid‐ S chiff, and negative for G omori trichrome stain and α‐smooth muscle actin. Conclusions One year following surgical excision, the patient remains disease free. The histological findings established a diagnosis of a rare canine intra‐orbital low‐grade myxosarcoma.