Uso de resina acrílica no preenchimento de cavidade orbital após exenteração em um cão com hemangiossarcoma conjuntival / Use of acrylic resin to fill the orbital cavity after exenteration in a dog with conjunctival hemangiosarcoma

ABSTRACT

Background: The hemangiossarcoma (HSA) is a malignant tumor originated from the alterations of vascular endothelialcells. As it has an aggressive behavior, it is indicated, as initial treatment, wide surgical excision, such as the exenteration, which results in the surgical removal of the ocular bulb and adjacent tissues. The referred technique has as a resulta concave orbit and aesthetically unacceptable. Therefore, various materials, used as orbital implants, have been studiedand used in several species. Thus, it was aimed to report the use of the polymethylmethacrylate (PMMA) to fill the orbitalcavity after exenteration in a dog with conjunctival HSA.Case A 10-year-old male Pitbull dog was assisted, with a clinical history of growth of a reddish tissue in the left eye, causingconstant hemorrhage, with an evolution of two months. At ophthalmic examination of the left eye, in the temporal bulbar conjunctive was found a reddish neoformation, with an irregular surface, measuring approximately 4 x 2 x 2 cm. The biopsy andaspiration cytology of the neoformation, revealed cells that inferred that they were those of conjunctival HSA. The hemogramrevealed normocytic anemia; the biochemical profile was with the standards of normality and no metastasis were found in theultrasonography and X-ray. The treatment of choice was the exenteration. Initially, the palpebral borders were approximatedusing continuous simple suture wit monofilament nylon thread. An incision was made in the skin, along the orbital rim andthen was performed a rhombus dissection of the conjunctive and all the extraocular muscles. Next, the eye globe, together withthe neoplasia, soft tissues of the orbital cavity and third eyelid were removed. The PMMA was obtained from a mixture of thepowder (polymer) and of the liquid (monomer) in the ratio of 11 in a sterile recipient, in...