Canine Primary Corneal Fibrosarcoma - Case Report

Histological observations on aural fibrosarcoma in a Holstein cow

Fibrosarcomas occur as a mesenchymal tumour of malignant fibroblasts in a collagen background and are usually found in the female genital organs and rarely involve the skin. A 5-year-old female Holstein cow with a raised mass at the base of right ear was referred. On gross examination, the mass was approximately 13.00 × 10.00 × 7.00 cm in size. Finally, complete surgical removal was selected. The mass was encapsulated and the dermis was expanded by spindle-shaped to polygonal neoplastic cells. These cells were arranged in interwoven pattern. Mitotic figures were infrequent. Masson's trichrome demonstrated the positive and blue staining of collagen. Immunohistochemically, the sections were uniformly positive for Vimentin and negative for Desmin, SMA and GFAP. A well-differentiated fibrosarcoma was diagnosed based on histopathological features. Surgical excision is the treatment of choice for this neoplasm. In the present case, surgery was also performed successfully and no new growth of the mass was observed 4 months following the surgical procedures. To our knowledge, this is the first report of well-differentiated fibrosarcoma in a Holstein cow.

Reporte de caso: Tumor de células en forma de huso en un canino (fibrosarcoma)

Este trabajo presenta y documenta el caso clínico de un canino y los hallazgos histopatológicos de un tumor de células en forma de huso, subcutáneo, en región cervical con metástasis a región faringo–laringo–traqueal. El paciente fue un canino macho, raza caniche, de 5 años, llevado a la clínica veterinaria de la Universidad de los Llanos. Al examen físico se evidenció en porción dorsal del cuello una masa subcutánea, indolora, firme, de 18 x 11cm, mucosas pálidas, ganglios retrofaríngeos aumentados de tamaño y epifora bilateral. Se realiza eutanasia y necropsia, se toman muestras de tejidos fijados en formalina buffer al 10% que se envía al laboratorio de histopatología animal. Las muestras se procesaron mediante métodos rutinarios para microscopía óptica. Cortes histológicos de 3-4 μm de grosor fueron coloreados con hematoxilina–eosina (H&E) y coloración tricrómica de Masson. En la necropsia se encontró una masa cervical dorsal aparentemente encapsulada, de 18 x 11 cm, firme, anclada al ligamento nucal, zonas de consistencia blanda, puntos rojos y superficie rugosa. Adicionalmente, se encontró nódulo tumoral, firme, fibroso de 6x4 cm en región faringo–laringo–traqueal izquierda. En el examen microscópico se observaron zonas de bastante celularidad arregladas en forma de fascículos, núcleos pleomórficos hipercromáticos con forma de huso, con 1 a 2 nucleolos y otras zonas con menor celularidad en un estroma fibromixoide. Con la coloración de tricrómico de Masson, el 50% de las células adquiere una coloración azul, positiva para fibras colágenas. Se diagnosticó un tumor de células en forma de huso maligno, clasificado como fibrosarcoma.

Mediastinal Fibrosarcoma in a Dog–Case Report

This represents the first published case report of mediastinal fibrosarcoma in a dog. An 8-year-old male neutered mixed breed dog was presented for evaluation of lethargy and increased panting. Thoracic focused assessment with sonography for trauma revealed moderate pleural effusion. Thoracic radiograph findings were suggestive of a cranial mediastinal mass. Computed tomography revealed a mass within the right ventral aspect of the cranial mediastinum. On surgical exploration, a cranial mediastinal mass with an adhesion to the right cranial lung lobe was identified and removed en-bloc using a vessel sealant device and requiring a partial lung lobectomy. Histopathology results described the cranial mediastinal mass as fibrosarcoma with reactive mesothelial cells identified within the sternal lymph node. The patient was treated with systemic chemotherapy following surgical removal. To date, the dog has survived 223 days following diagnosis with recurrence noted 161 days following diagnosis and radiation therapy was initiated. Primary cranial mediastinal fibrosarcoma while a seemingly rare cause of thoracic pathology in dogs, should be considered in the differential diagnosis for a cranial mediastinal mass.