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Brazilian journal of veterinary pathology
Volume 16 | Issue 1 (March 2023)

Fibroblastic osteosarcoma in a guinea pig (Cavia porcellus)

Braz J Vet Pathol. March 2023;16(1):46-50. 33 Refs
Joerg Richard Vetter1, Leila Gertrudis Maidana, Roger Gonzalez-Vatteone, César Esteban Brítez-Valinotti, Raquel Ramírez-Diarte
1 Departamento de Recursos Faunísticos y Medio Natural, Facultad de Ciencias Veterinarias, Universidad Nacional de Asunción, PO BOX 1061, San Lorenzo 2160, Paraguay.

Author Abstract

The article describes the case of a 3 year 6 months old Guinea Pig (Cavia porcellus) that was assisted at the Wildlife and Exotic Animal Practice of the Faculty of Veterinary Sciences, National University of Asunción. The patient presented a hard mass in the right hind limb extending from the proximal portion of the femur, projecting caudally to the proximal tuberosity of the calcaneus, with an increase in temperature, and a marked increase in sensitivity. Radiographic diagnosis refers to a mass with amorphous areas of mineral density. Fine needle aspiration puncture revealed an undifferentiated malignant proliferative process, requiring histopathological analysis to characterize the process. Disarticulation was performed and subsequent histopathologic diagnosis under hematoxylin-eosin and Masson’s trichrome stain revealed fibroblastic osteosarcoma.


Cavia porcellus, neoplasm, bone, Paraguay

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