PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Silva C.A.O., Perri S.H.V., Koivisto M.B., Silva A.M., Carvalho R.G. & Monteiro C.M.R. 2009. [Histological and morphometric evaluation of the testes of cats (Felis catus).] Aspectos histológicos e morfométricos dos testículos de gatos domésticos (Felis catus). Pesquisa Veterinária Brasileira 29(4):312-316. Curso de Medicina Veterinária, Faculdade de Odontologia, Universidade Estadual Paulista, Rua Clóvis Pestana 793, Araçatuba, SP 16050-680, Brazil. E-mail: monteiro@fmva.unesp.br This paper deals with a comparative histologic and morphometric study of the testes of domestic cats distributed into two groups: Group 1, cats until 1 year of age, and Group 2, cats over 1 year. It was found that: (1) at 4 months of age the seminiferous tubules were poorly developed, appeared as seminiferous cords without lumen, lined by a low epithelium, and showed undifferentiated Sertoli cells and scarce interstitial tissue; (2) at 5 months the seminiferous tubules began to differentiate with increase in tubular diameter and lumen, the other tubular structures remaining similar to those previous referred; (3) at 6 and 7 months of age spermatocytogenesis began to appear, Leydig cells were large, polyhedral in shape, with vacuolated cytoplasm and clear nuclei, resting on a sparse interstitial tissue with few blood vessels; (4) 1-year-old cats showed testicular histological features of an adult animal, had seminiferous tubules of large diameter and high seminiferous epithelium with small lumen, and Leydig cells of different sizes, with polyhedral shape, vacuolated cytoplasm, clear nuclei and evident nucleoli resting in a sparse interstitial tissue with some blood vessels; (5) in Group 1 the average diameter of the seminiferous tubules was 160.58µm, and 185.94µm in Group 2; (6) the height of the seminiferous epithelium was 49.51µm for Group 1 and 63.29µm for Group 2; (7) the largest measures of the analyzed parameters were found in animals of Group 2, with functional reproductive organs.

• Histology morphometry testes cats

Abstract in Portuguese:

ABSTRACT.- Silva C.A.O., Perri S.H.V., Koivisto M.B., Silva A.M., Carvalho R.G. & Monteiro C.M.R. 2009. [Histological and morphometric evaluation of the testes of cats (Felis catus).] Aspectos histológicos e morfométricos dos testículos de gatos domésticos (Felis catus). Pesquisa Veterinária Brasileira 29(4):312-316. Curso de Medicina Veterinária, Faculdade de Odontologia, Universidade Estadual Paulista, Rua Clóvis Pestana 793, Araçatuba, SP 16050-680, Brazil. E-mail: monteiro@fmva.unesp.br This paper deals with a comparative histologic and morphometric study of the testes of domestic cats distributed into two groups: Group 1, cats until 1 year of age, and Group 2, cats over 1 year. It was found that: (1) at 4 months of age the seminiferous tubules were poorly developed, appeared as seminiferous cords without lumen, lined by a low epithelium, and showed undifferentiated Sertoli cells and scarce interstitial tissue; (2) at 5 months the seminiferous tubules began to differentiate with increase in tubular diameter and lumen, the other tubular structures remaining similar to those previous referred; (3) at 6 and 7 months of age spermatocytogenesis began to appear, Leydig cells were large, polyhedral in shape, with vacuolated cytoplasm and clear nuclei, resting on a sparse interstitial tissue with few blood vessels; (4) 1-year-old cats showed testicular histological features of an adult animal, had seminiferous tubules of large diameter and high seminiferous epithelium with small lumen, and Leydig cells of different sizes, with polyhedral shape, vacuolated cytoplasm, clear nuclei and evident nucleoli resting in a sparse interstitial tissue with some blood vessels; (5) in Group 1 the average diameter of the seminiferous tubules was 160.58µm, and 185.94µm in Group 2; (6) the height of the seminiferous epithelium was 49.51µm for Group 1 and 63.29µm for Group 2; (7) the largest measures of the analyzed parameters were found in animals of Group 2, with functional reproductive organs.

Abstract in English:

ABSTRACT.- Pereira I.A., Soares L.C., Coelho S.M.O., Pribul B.R. & Souza M.M.S. 2009. [Susceptibility to azithromycin of bacteria isolated from infectious processes in dogs and cats.] Suscetibilidade à azitromicina de isolados bacterianos de processos infecciosos em cães e gatos. Pesquisa Veterinária Brasileira 29(2):153-156. Departamento de Microbiologia e Imunologia Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: miliane@ufrrj.br The susceptibility pattern to azithromycin of bacterial pathogens from various infectious sites, and the in vitro activity and minimum inhibitory concentration (MIC) of azithromycin were studied. Tests such as disc diffusion and broth microdilution detected respectively 48.6% and 55% of resistant Staphylococcus spp., and 55.3% and 72.7% resistant gram-negative rods. MIC50 for S. aureus was 4.0mg/mL, that for S. intermedius was 1.0mg/mL, for coagulase-negative Staphylococcus e”512mg/mL, and for gram-negative rods 256mg/mL. Fifteen percent (9/60) of oxacilin-resistant, multidrug-resistant and mecA-positive Staphylococcus spp. isolates were also azithromycin resistant. The dissemination of multidrug resistant bacteria points out to the need of antimicrobial evaluation activity in order to select the best indicated drug and thus minimizing therapeutic failures in veterinary practice.

• Diseases of dogs and cats bacterial diseases bacterial antibiotic resistance azithromycin

Abstract in Portuguese:

ABSTRACT.- Pereira I.A., Soares L.C., Coelho S.M.O., Pribul B.R. & Souza M.M.S. 2009. [Susceptibility to azithromycin of bacteria isolated from infectious processes in dogs and cats.] Suscetibilidade à azitromicina de isolados bacterianos de processos infecciosos em cães e gatos. Pesquisa Veterinária Brasileira 29(2):153-156. Departamento de Microbiologia e Imunologia Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil. E-mail: miliane@ufrrj.br The susceptibility pattern to azithromycin of bacterial pathogens from various infectious sites, and the in vitro activity and minimum inhibitory concentration (MIC) of azithromycin were studied. Tests such as disc diffusion and broth microdilution detected respectively 48.6% and 55% of resistant Staphylococcus spp., and 55.3% and 72.7% resistant gram-negative rods. MIC50 for S. aureus was 4.0mg/mL, that for S. intermedius was 1.0mg/mL, for coagulase-negative Staphylococcus e”512mg/mL, and for gram-negative rods 256mg/mL. Fifteen percent (9/60) of oxacilin-resistant, multidrug-resistant and mecA-positive Staphylococcus spp. isolates were also azithromycin resistant. The dissemination of multidrug resistant bacteria points out to the need of antimicrobial evaluation activity in order to select the best indicated drug and thus minimizing therapeutic failures in veterinary practice.

Abstract in English:

ABSTRACT.- Souza T.M., Fighera R.A., Kommers G.D. & Barros C.S.L. 2009. [Histological aspects of canine and feline skin as a tool for dermatopathology.] Aspectos histológicos da pele de cães e gatos como ferramenta para dermatopatologia. Pesquisa Veterinária Brasileira 29(2):177-190. Departamento de Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. E-mail: teitsouza@yahoo.com.br Skin morphology differs among different animal species and most part of our knowledge on the morphology of human skin can not be applied for dogs and cats. Thus, the understanding of the basic morphologic aspects of the skin from different species is an invaluable tool for every professional in the field of veterinary pathology. Furthermore, the ability to recognize the main similarities and main differences in the skin morphology from different anatomical signs within the same animal is fundamental to the practice dermatopathology. This paper reviews the major aspects of the microscopic anatomy of the skin in dogs and cats, aiming to help those veterinary pathologists that are starting in the field of dermatopathology, since only with the knowledge of the peculiarities of this organ it will be possible to apply the diagnostic approach through lesion patterns.

• Morphology histology pathology dermatopathology skin dogs and cats

Abstract in Portuguese:

ABSTRACT.- Souza T.M., Fighera R.A., Kommers G.D. & Barros C.S.L. 2009. [Histological aspects of canine and feline skin as a tool for dermatopathology.] Aspectos histológicos da pele de cães e gatos como ferramenta para dermatopatologia. Pesquisa Veterinária Brasileira 29(2):177-190. Departamento de Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. E-mail: teitsouza@yahoo.com.br Skin morphology differs among different animal species and most part of our knowledge on the morphology of human skin can not be applied for dogs and cats. Thus, the understanding of the basic morphologic aspects of the skin from different species is an invaluable tool for every professional in the field of veterinary pathology. Furthermore, the ability to recognize the main similarities and main differences in the skin morphology from different anatomical signs within the same animal is fundamental to the practice dermatopathology. This paper reviews the major aspects of the microscopic anatomy of the skin in dogs and cats, aiming to help those veterinary pathologists that are starting in the field of dermatopathology, since only with the knowledge of the peculiarities of this organ it will be possible to apply the diagnostic approach through lesion patterns.

Abstract in English:

ABSTRACT.- Romano L., Ferrígno C.R.A., Ferraz,V.C.M. Della Nina M., Ito K.C. 2008. [Evaluation of the use of interlocking nail and transcortical blockade for the repair of diaphyseal fractures of the femur in cats.] Avaliação do uso de haste bloqueada e bloqueio transcortical no reparo de fraturas diafisárias de fêmur em felinos. Pesquisa Veterinária Brasileira 28(4):201-206. Departamento de Cirurgia do Hospital Veterinário, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenida Prof. Dr. Orlando Marques de Paiva 87, São Paulo, SP 05508-270, Brazil. E-mail: lromano@usp.br Interlocking nails allow rigid fracture stabilization and present biomechanical advantages when compared to other immobilization techniques. It acts along the central mechanical axis of the bone and preserves biological concept standards for osteosynthesis. The use of interlocking nail in cats is limited because the intramedullary space is relatively small for the available nail sizes. We reported 10 cases of cats that had simple or multiple closed fractures of the femoral diaphysis. The animals weighed 3.5 to 5 kg , which allowed using nails of 4.0mm and 4.7mm in diameter. For the nail insertion, retrograde and normograde routs were used, and four 2mm titanium screws were used to lock all the perforations. No trans-surgical complication occurred, however, due to a new trauma, one of the animals suffered femoral neck fracture and transversal distal fracture to the nail, three days after surgery. Radiographies were made up to four months after surgery, and in most cases secondary bone formation was seen, showing bone consolidation in 61-89 days, excluding the animal who suffered new trauma, who presented bone healing in 150 days. Clinically, occasional lameness occurred; however, except for the animal that had new trauma, all animals initiated adequate limb support in 3 to 8 days after surgery. In conclusion, the use of 4.0mm and 4.7mm interlocking nails in felines was adequate, with bone healing in all cases, and also return of good limb function after surgery.

• Fractures interlocking nail surgery cats

Abstract in Portuguese:

ABSTRACT.- Romano L., Ferrígno C.R.A., Ferraz,V.C.M. Della Nina M., Ito K.C. 2008. [Evaluation of the use of interlocking nail and transcortical blockade for the repair of diaphyseal fractures of the femur in cats.] Avaliação do uso de haste bloqueada e bloqueio transcortical no reparo de fraturas diafisárias de fêmur em felinos. Pesquisa Veterinária Brasileira 28(4):201-206. Departamento de Cirurgia do Hospital Veterinário, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenida Prof. Dr. Orlando Marques de Paiva 87, São Paulo, SP 05508-270, Brazil. E-mail: lromano@usp.br Interlocking nails allow rigid fracture stabilization and present biomechanical advantages when compared to other immobilization techniques. It acts along the central mechanical axis of the bone and preserves biological concept standards for osteosynthesis. The use of interlocking nail in cats is limited because the intramedullary space is relatively small for the available nail sizes. We reported 10 cases of cats that had simple or multiple closed fractures of the femoral diaphysis. The animals weighed 3.5 to 5 kg , which allowed using nails of 4.0mm and 4.7mm in diameter. For the nail insertion, retrograde and normograde routs were used, and four 2mm titanium screws were used to lock all the perforations. No trans-surgical complication occurred, however, due to a new trauma, one of the animals suffered femoral neck fracture and transversal distal fracture to the nail, three days after surgery. Radiographies were made up to four months after surgery, and in most cases secondary bone formation was seen, showing bone consolidation in 61-89 days, excluding the animal who suffered new trauma, who presented bone healing in 150 days. Clinically, occasional lameness occurred; however, except for the animal that had new trauma, all animals initiated adequate limb support in 3 to 8 days after surgery. In conclusion, the use of 4.0mm and 4.7mm interlocking nails in felines was adequate, with bone healing in all cases, and also return of good limb function after surgery.

Abstract in English:

ABSTRACT.- Bonel-Raposoj., Driemeier D., Barros S.S. & Gevehr~Fernandes C. 2003. [Histological and ultrastructural evolution of liver lesions in experimental Myoporum laetum poisoning of sheep and cattle.] Evolução das lesões histológicas e ultra-estruturais no fígado de ovinos e bovinos experimentalmente intoxicados por Myoporum laetum. Pesquisa Veterinária Brasileira 23(4):149-155. Depto Patologia Animal, Faculdade de Veterinária, UFPel, Pelotas, RS 96010-900, Brazil. E-mail: bonel-raposo@brturbo.com Green leaves of Myoporum laetum were collected during spring and summer, and administered to five sheep and six steers at dosages of 20 and 30 g/kg. Liver biopsies were taken before (Controls) and 1, 3 and 7 days after dosage. ln sheep, the clinicai signs were depression, rumen hypomotility, dried feces, tenesmus, teeth grinding, dyspnea and typical lesions of photosensitization. ln cattle, the clinicai picture was much less pronounced. The main histological findings in sheep were vacuolization of hepatocytes, portal ftbrosis, bile duct proliferation and necrosis of periportal hepatocytes; the ultrastructural examination revealed hyperplasia of the smooth endoplasmic reticulum, hepatocellular hydropic degeneration, presence of crystals and severa! other degenerative changes. ln cattle both, the histological and the ultrastructural findings, were less evident.

• Poisonous plants plant poisoning Myoporum laetum sheep cattle Plantas tóxicas intoxicação por plantas ovinos bovinos.

Abstract in Portuguese:

RESUMO.- Bonel-Raposoj., Driemeier D., Barros S.S. & Gevehr~Fernandes C. 2003. [Histological and ultrastructural evolution of liver lesions in experimental Myoporum laetum poisoning of sheep and cattle.] Evolução das lesões histológicas e ultra-estruturais no fígado de ovinos e bovinos experimentalmente intoxicados por Myoporum laetum. Pesquisa Veterinária Brasileira 23(4):149-155. Depto Patologia Animal, Faculdade de Veterinária, UFPel, Pelotas, RS 96010-900, Brazil. E-mail: bonel-raposo@brturbo.com Amostras de Myoporum laetum foram colhidas durante a primavera e verão e administradas a cinco ovinos e seis bovinos em doses únicas de 20 e 30 g/kg. Biópsias hepáticas foram colhidas antes (controles) e 1, 3 e 7 dias após a dosagem da planta. Estas biópsias foram analisadas histológica e ultraestruturalmente. Os sinais clínicos, em ovinos, caracterizaramse, especialmente; pordepressão, diminuição dos movimentos ruminais, fezes ressequidas, tenesmo, ranger de dentes, dispnéia e lesões típicas de fotossensibilização. Em bovinos, o quadro clínico foi discreto. Os principais achados histológicos, em ovinos, incluíram vacuolização de hepatócitos, fibrose portal, proliferação de duetos biliares e necrose de hepatócitos periportais. Os estudos ultra-estruturais, em ovinos, revelaram hiperplasia do retículo endoplasmático liso, tumefação de hepatócitos, degranulação e vesiculação do retículo endoplasmático rugoso, presença de cristais aciculares, retenção biliar, tumefação de mitocôndrias e várias outras alterações degenerativas. Em bovinos, tanto os achados histológicos, quanto os ultra-estruturais foram menos evidentes.

Abstract in English:

NO ABSTRACT

• No Index Terms sem termos de indexação.

Abstract in Portuguese:

SEM RESUMO

Abstract in English:

ABSTRACT.- Fighera R.A., Souza T.M., Langohr I. & Barros C.S.L. 2002. [Experimental onion Allium cepa (Liliaceae) poisoning in cats.] Intoxicação experimental por cebola, Allium cepa (Liliaceae), em gatos. Pesquisa Veterinária Brasileira 22(2):79-84. Depto Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil. Email: anemiaveterinaria@bol.com.br Onion poisoning is reported worlwide in several animal species. The toxic principie (npropyl dissulfide) present in onions causes the transformation of hemoglobin in methemoglobin. In order to study the laboratory, gross and histopathological tindings in onion poisoning in cats, tive 4-month-old cats were fed a single dose of 10g/kg of dried-onion each. Another cat of the sarne age did not receive the onion meal and served as control. AII tive cats developed clinical signs of the toxicosis; one of them died within 24 hours of the ingestion of the onion meal. Clinical signs included apathy, tachycardia, tachypnea, and cyanosis. Laboratory tindings included hemolytic anemia associated with Heinz bodies and methemoglobinemia. Main necropsy tindings were splenomegaly and brown discoloration of blood. Histopathological tindings included splenic and hepatic hemosiderosis and multifocal extramedullary hematopoiesis.

• Poisonous plants Allium cepa onion hemolytic anemia methemoglobinemia Heinz bodies diseases of cats pathology Intoxicação por plantas cebola anemia hemolítica metemoglobinemia corpúsculos de Heinz doenças de gatos patologia.

Abstract in Portuguese:

RESUMO.- Fighera R.A., Souza T.M., Langohr I. & Barros C.S.L. 2002. [Experimental onion Allium cepa (Liliaceae) poisoning in cats.] Intoxicação experimental por cebola, Allium cepa (Liliaceae), em gatos. Pesquisa Veterinária Brasileira 22(2):79-84. Depto Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil. Email: anemiaveterinaria@bol.com.br A intoxicação por cebola é relatada em várias espécies animais em muitas partes do mundo. O princípio tóxico (n propil dissulfito) presente na cebola causa a transformação da hemoglobina em metemoglobina. Para estudar os achados laboratoriais, de necropsia e histopatológicos da intoxicação por cebola em gatos, cinco gatos de quatro meses de idade receberam cada um uma dose única de 10g/kg de cebola desidratada por via oral. Um outro gato de mesma idade não recebeu a refeição com cebola e serviu como controle. Todos os cinco gatos desenvolveram sinais clínicos da toxicose; um deles morreu dentro de 24 horas após a ingestão da cebola. Os sinais clínicos incluíram apatia, taquicardia, taquipnéia e cianose. Os achados laboratoriais se caracterizavam por anemia hemolítica associada a corpúsculos de Heinz e metemoglobinemia. Os principais achados de necropsia foram esplenomegalia e sangue de cor marrom. Os achados histopatológicos foram hemossiderose e hematopoese extramedular no baço e fígado.

Abstract in English:

ABSTRACT.- Caldas A.P.F., Leal E.S., Silva E.F.A. & Ravazzolo A.P. [Detection of feline immunodeficiency provirus in domestic cats by polymerase chain reaction.] Detecção do provírus da Imunodeficiência Felina em gatos domésticos pela técnica de Reação em Cadeia da Polimerase. Pesquisa Veterinária Brasileira 20(1):20-25. Centro de Biotecnologia/Faculdade de Veterinária, UFRGS, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil. Feline immunodeficiencyvirus (FIV) infection of domestic cats is one of the most promising animal models for the infection by the human immunodeficiency virus (HIV) which causes acquired immunodeficiency syndrome (AIDS). lnfected cats may develop a disease similar to that observed in AIDS patients, with increased susceptibility to opportunistic infections. Ln this study we used the polymerase chain reaction (PCR) to detect proviral DNA of feline immunodeficiency virus on the blood and tissue samples from cats with a clinical diagnosis of immunodeficiency. The PCR primers were used to amplify the gag gene, which is conserved among different isolates. From 40 samples analyzed, 15 were positive and 4 of them were submitted to hybridization to confirm the specificity of the amplified fragments. These results confirm the presence of FIV in domestic cats in Rio Grande do Sul, Brazil.

• Feline immunodeficiency virus FIV polymerase chain reaction PCR Vírus da Imunodeficiência Felina Reação em Cadeia da Polimerase.

Abstract in Portuguese:

SINOPSE.- Caldas A.P.F., Leal E.S., Silva E.F.A. & Ravazzolo A.P. [Detection of feline immunodeficiency provirus in domestic cats by polymerase chain reaction.] Detecção do provírus da Imunodeficiência Felina em gatos domésticos pela técnica de Reação em Cadeia da Polimerase. Pesquisa Veterinária Brasileira 20(1):20-25. Centro de Biotecnologia/Faculdade de Veterinária, UFRGS, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil. A infecção de gatos domésticos pelo Vírus da Imunodeficiência Felina (FIV) é um dos modelos mais promissores para o estudo da infecção pelo vírus da imunodeficiência humana (HIV) que causa a Síndrome de Imunodeficiência Adquirida (AIDS). O FIV causa, em gatos, uma enfermidade similar àquela observada em pacientes com AIDS, sobretudo no que diz respeito ao aumento da susceptibilidade a infecções oportunistas. No presente estudo, utilizou-se a Reação em Cadeia da Polimerase (PCR), com o objetivo de detectar o provírus do FIV em gatos com sinais clínicos de imunodeficiência. O fragmento de DNA escolhido como alvo para amplificação situa-se no gene gag do lentivírus felino, o qual é conservado entre as diferentes amostras do vírus. O DNA utilizado foi extraído a partir de amostras de sangue e de tecidos de animais com suspeita clínica de imunodeficiência. Das 40 amostras analisadas, 15 foram positivas, das quais 4 foram submetidas à hibridização, confirmando a especificidade dos fragmentos amplificados. Esses resultados demonstram a presença do FIV na população de gatos domésticos do Rio Grande do Sul, Brasil.

Abstract in English:

The ultrastructural changes in the cerebellum of 2 calves experimentally poisoned with Solanum sp. and 1 calf poisoned with Solanum fastigiatum var. fastigiatum are described. The lesions induced were basically the sarne in all three animals. The perikarya of the Purkinje cells contained numerous lipid inclusions similar to those found in the inherited or induced neurolipidoses. These inclusions seemed to derive from the endoplasmic reticulum from which the lamellar bodies, vesiculo-membranous bodies, cytoplasmic membranous bodies and dense bodies take their origin. Similar changes occurred in the axys cylinders and dendrites of these cells. The morphological evidence suggests that the lipidic inclusions are the result of the formation of lipid complexes resistant to metabolism, rather than a lysosomal defect such as occurs in the inherited lipidoses.

• Plant poisoning Solanum fastigiatum var. fastigiatum Solanum sp. storage diseases cerebellar degeneration induced neurolipidoses

Abstract in Portuguese:

Três terneiros foram experimentalmente intoxicados, dois com Solanum sp. e um com Solanum Jastigiatum var. fastigiatum. Foram estudadas as alterações ultraestruturais induzidas no cerebelo. As lesões foram basicamente as mesmas para os três animais. O citoplasma das células de Purkinje continha numerosas inclusões lipídicas semelhantes àquelas encontradas nas neurolipidoses hereditárias ou induzidas. Essas inclusões parecem derivar do retículo endoplasmático de onde se originam os corpos lamelares, corpos vesículo-membranosos, corpos citoplasmático-membranosos e corpos densos. Lesões semelhantes ocorreram nos axônios e dentritos dessas células. As evidências morfológicas sugerem que as inclusões lipídicas são o resultado da formação de complexos lipídicos resistentes ao metabolismo, ao invés de resultarem de um defeito lisossômico, tal como ocorre nas lipidoses hereditárias.

• Intoxicação por planta Solanum fastigiatum var.fastigiatum Solanum sp. doença de armazenamento degeneração cerebelar neurolipidose induzida

Abstract in English:

This is the first description of adenocarcinomas of the bile ducts of the cat (Felix cattus domesticus), naturally infected with the parasite Platynosornum fastosurn. The studies were based on four old female cats. The authors hypothesize a relationship between the parasites and the neoplasms, which is suggested by the appearance of neoplasms at the sites of parasitism. In a series of neoplasms diagnosed in cats in Brazil over a 20 year period by the authors, only 5 were primary to the liver, 4 of those being the duct carcinomas described. These findings are analagous to those reported in humans, cats and dogs parasitized by Clonorchis sinensis or Opistorchis felineus. The relatively advanced age of the animals studied and the long survival of certain trematodes in the biliary ducts indicate a chronic state of the lesions and their subsequent development into cancer.

• Platynosomum fastosum cholangiocellular carcinoma carcinogenesis by helminths cat

Abstract in Portuguese:

Os autores fazem a primeira descrição de adenocarcinomas de dutos biliares em gatos (Felix cattus domesticus) com parasitismo dutal por Platynosomum fastosum. A observação é baseada em quatro casos e os animais tinham respectivamente 8,9 e 13 anos de idade, não havendo indicações da idade no 4º caso. Todos os animais eram fêmeas. Os autores concluem pela interdependência entre a parasitose e as neoplasias surgidas, o que é patenteado pelo aparecimento das mesmas ao nível dos sítios parasitados; de outro lado, em uma série de neoplasias diagnosticadas em gatos pelos autores ao longo de 20 anos, apenas cinco eram primárias do fígado, quatro dos quais eram os carcinomas dutais ora descritos. O problema apresenta analogia com os carcinomas de dutos biliares registrados em humanos, gatos e cães parasitados por Clonorchis sinensis ou por Opistorchis felineus. A idade relativamente avançada dos animais estudados e a sobrevivência longa de certos trematódeos das vias biliares indicam uma cronicidade de lesões dutais e a sua posterior cancerização.

• Platynosomum fastosum colangiocarcinoma carcinogênese por helmintos gato