Leiomioma de bexiga em um cão

Sampaio, Rubia Avlade Guedes; Querino, Dallyana Roberta dos Santos; Medeiros, Carla Fernanda da Conceição; Meneses, Jássia da Silva; Barbosa, Francisca Maria Sousa; Alves, Alane Pereira; Lucena, Ricardo Barbosa

Leiomioma de bexiga em um cão

Sampaio, Rubia Avlade GuedesQuerino, Dallyana Roberta dos SantosMedeiros, Carla Fernanda da ConceiçãoMeneses, Jássia da SilvaBarbosa, Francisca Maria SousaAlves, Alane PereiraLucena, Ricardo Barbosa

Background: In dogs, neoplasms of the urinary bladder are uncommon; among urinary bladder tumors, transitional cell carcinoma is the most frequent type. Urinary bladder leiomyomas are rare mesenchymal tumors whose etiology is associated with urinary retention and exposure to carcinogens. Diagnosis of this neoplasm can be determined by histopathological analysis, and treatment is surgical. The aim of this report is to describe a case of leiomyoma in the urinary bladder of a dog.Case: A 10-year-old male mongrel dog was examined at the Veterinary Hospital of Federal University of Paraíba, where a mass in the urinary bladder was identified, and was estimated to have been developing over the course of a month. Hematuria, congested ocular mucosa, and engorged episcleral vessels were observed during the physical examination. Ultrasonographic examination confirmed distension of the urinary bladder, which exhibited anechoic content and echogenic sediment. A neoplasm measuring 8 x 3.39 cm was detected in the bladder wall. This neoplasm had mixed echogenicity, heterogeneous echotexture, and well-defined borders. Color Doppler ultrasonography allowed observation of vascularization inside the mass. The animal was subjected to cystotomy to excise the mass, which was slightly adhered to the inner wall of the bladder. After this procedure, the excised specimen was submitted for histopathological analysis. Macroscopic examination revealed that the mass was firm, lobulated, nodular, and resistant to cutting. The sample was fixed in 10% formalin; the fragments were processed and stained with hematoxylin and eosin (HE) or Massons trichrome (MT) for analysis by optical microscopy. The histopathological examination revealed that the mass was encapsulated, had well-delimited borders composed by bundles of elongated cells with no atypical characteristics. These cells exhibited a slightly eosinophilic cytoplasm that contained moderate to abundant fusiform nuclei.[...](AU)