Pelve extrarrenal em uma gata - diagnóstico por cintilografia / Extrarenal pelvis in a cat - diagnosis by scintigraphy

Background: In people, extrarenal pelvis is a normal anatomical variant, characterized by the protusion of the pelvis out of the renal hilum, which can be associated with other anomalies, or predispose to stasis or infection. While other diagnostic imaging methods provide anatomical and morphological information about the kidney, scintigraphy allows to determine the renal function and has greater sensitivity in the detection of functional alterations. The aim of this work is to report the case of an asymptomatic cat diagnosed with extrarenal pelvis detected by scintigraphy, which presented alterations in laboratory and renal imaging tests, and absence of associated obstructive process. Case: A 7-year-old mixed-breed female cat was evaluated for a routine health assessment at the Veterinary Teaching Hospital of the Federal University of Rio Grande do Sul (HCV-UFRGS). When performing the imaging and laboratory tests, renal alterations compatible with chronic kidney disease were found in the abdominal ultrasonography examination and in serum creatinine levels. Therefore, it was decided to perform scintigraphy evaluation to better assess renal function. Dynamic renal scintigraphy with 99mTcDTPA revealed an evident concentration of the radiotracer in the left kidney with effective elimination only after the diuretic stimulus. The right kidney exhibited less concentration of the radiotracer but showed effective elimination before the diuretic stimulus. Image analysis suggested the presence of an extrarenal pelvis on the left side. The relative renal uptake was 68% for the left kidney and 32% for the right kidney. The glomerular filtration rate was 1.65 mL/min/kg. Static renal scintigraphy with 99mTcDMSA revealed irregularity in the distribution of the radiotracer in both kidneys, showing less activity in the caudal pole of the left kidney. The right kidney was apparently reduced and with less activity, especially in the medial portion. The relative renal uptake was 65% for the left kidney and 35% for right kidney, while the absolute renal uptake of the left kidney was 33% and that of the right kidney was 17%. The alteration described in the left kidney, in correlation with dynamic renal scintigraphy, suggested an aspect of lower activity in the caudal pole due to the presence of activity in the extrarenal pelvis. The left kidney was classified as presenting normal renal function and there was moderate to severe deficit of renal function on the right side. Discussion: Chronic kidney disease may be present before clinical signs and biochemical abnormalities are identified. In this report, the animal was referred for a routine evaluation and showed no clinical signs nor alterations on physical examination. However, as renal morphological alterations were seen on ultrasonography and the cat presented mild azotemia, it was decided to perform two renal scintigraphy exams. Despite the radiotracer elimination from the left kidney was seen only after the diuretic stimulus, dynamic renal scintigraphy did not show any obstructive process. This delay on elimination was probably a result of the anatomical variant called extrarenal pelvis. In the static renal scintigraphy, it was possible to evaluate morphological changes in the kidneys and suggest less activity in the caudal pole of the left kidney, due to the presence of activity in the extrarenal pelvis, apparently causing the mentioned defect. The correct diagnosis of morphological changes is essential and for this purpose the best combination of imaging tests is necessary. Renal scintigraphy was fundamental, in this case, for the diagnosis of extrarenal pelvis in one of the kidneys, an abnormality not reported in the feline species within the literature researched by the authors. In addition, renal scintigraphy helped to guide the clinical management of the patient described in this report.

Enostose múltipla em equino puro sangue de corrida / Enostosis-like lesion in thoroughbred horse

Background: Enostosis like lesions are characterized by areas of intramedullary sclerosis affecting the long bones andtheir presence in any cases may be not associated with lameness. It has a migratory characteristic and, therefore there isthe occurrence of lameness at different sites from the initial lesion. Its etiology is speculative and has been attributed tointraosseous increased pressure, of Havers’ canals compression, stimulation of unmyelinated fibers and circulating plateletaggregates. Diagnosis is made through nuclear scintigraphy and associated with radiographic examination. This paperaims to report a clinical case on the use of scintigraphy for the reference diagnosis of enostosis-type injury and treatmentthrough surgical bone decompression.Case: A 2-year-old thoroughbred mare, weighing 483 kg, with a history of acute lameness of the left pelvic limb associatedwith the no previous signs of trauma and no noteworthy changes in radiographic and ultrasound images, was referred to theHorse Center Veterinary Clinic. In the examination of the locomotor system, the animal presented a 2/5 degree lamenessin a straight line, with accentuated exacerbation of the same after flexion of the left femoro-tibio-patellar joint. In addition,presented a reduction in the caudal phase of the stride and croup asymmetry associated with mild myopenia. The findingsof the scintigraphic exam characterized by intense focal area of hyperconcentration of medullary radiopharmaceutical inthe proximal third of the right third metatarsal, and multiple areas of hyperconcentration in the aspect proximal to thedistal third of the left tibia. In the radiographic images, multifocal radiopaque regions that coincided with the areas ofradiopharmaceutical hyperconcentration were observed. The initial treatment was based on rest, use of non-steroidal antiinflammatory drugs and acetylsalicylic acid. In the 60 days...

Influence of biomaterials on scintigraphic diagnosis of periprosthetic infections. Ceftizoxime-99m technetium model

Purpose: To compare the influence of two metallic implants in the diagnosis of periprosthetic infection using 99m technetium-labeled ceftizoxime.Methods: Twenty rats were randomly divided into four groups, which received sterile and contaminated titanium and stainless steel implants. After 3 weeks, scintilographic images were obtained using a gamma chamber. Radioactivity counts were obtained for the region of interest (ROI) on the operated and non-operated paws.Results: Groups A, B, and C showed homogenous distribution of the radiopharmaceutical. Hyper uptake was observed in the operated paw from group D. The ROI target count was higher in the two groups with stainless steel implants. Among the control groups, the count was higher in the stainless steel group. Furthermore, among the contaminated groups, the uptake was higher in the stainless steel group, with a significant difference. The target: non-target ratio was significantly lower in the control and contaminated groups with both titanium and stainless steel, but the comparison between control groups and contaminated groups was only significant in the former. The cpm/g observed after a decay of 48h showed statistically significant differences between groups.Conclusion: Different biomaterials used in implants have an influence on the results of scintigraphy with 99mTc-CFT.(AU)

Postnatal evaluation of intrauterine hydronephrosis due to ureteropelvic junction obstruction / Avaliação pós-natal de hidronefrose intra-uterina por estenose da junção ureteropiélica

PURPOSE: Fetal hydronephrosis is a frequent finding due to advances in prenatal ultrasonography. The definition of fetal and neonatal urinary tract obstruction is a very difficult task requiring confirmation of reduced renal function and hydronephrosis. In this study we followed a series of consecutive patients with intrauterine hydronephrosis that persisted during post-natal life. METHODS: 116 newborns with antenatal hydronephrosis diagnosed by ultrasound and submitted to a specific post-natal evaluative protocol with a follow-up period of 6 years. RESULTS: In 45 (38.8%) of 116 patients, ureteropelvic junction (UPJ) obstruction was confirmed and surgical correction of the UPJ obstruction was done in 19 patients. From 26 children who were initially submitted to non-surgical treatment, only 6 (23%) needed a surgical approach during follow up. Overall analysis showed that surgery was performed in 25 patients with UPJ obstruction, and the others 20 patients were kept under clinical observation, since normal renal function was confirmed by scintigraphy scans. CONCLUSION: Fetal hydronephrosis due to UPJ obstruction deserves careful postnatal evaluation. UPJ obstruction is the most frequent anomaly and its surgical treatment has very precise indications. The evaluative protocol was useful in identify patients that could be followed-up with a non-surgical approach.(AU)

OBJETIVO: Com a ampla utilização dos exames ultrassonográficos na avaliação pré-natal, é frequente o diagnóstico da hidronefrose fetal. A definição de obstrução do trato urinário no periodo pós-natal necessita da confirmação de redução da função renal além da hidronefrose. Neste estudo, acompanhamos uma série de pacientes consecutivos com hidronefrose intra-útero que persistiu no periodo pós-natal. MÉTODOS: 116 recém-nascidos com hidronefrose pré-natal diagnosticada pela ultrassonografia foram submetidos a protocolo específico de avaliação e companhados pelo periodo de 06 anos. RESULTADOS: Em 46 (38,8%) dos 116 pacientes foi confirmado o diagnóstico de estenose da junção ureteropiélica (JUP). Conforme os resultados do protocolo aplicado a correção cirúrgica da estenose da JUP foi realizada em 19 pacientes. Das 26 crianças encaminhadas inicialmente para observação clínica, apenas 6 (23%) necessitaram cirurgia durante o seguimento ambulatorial. Na análise geral, o procedimento cirúrgico para correção da estenose da JUP foi indicado em 25 pacientes. Nas outras 20 crianças não houve necessidade da realização da cirurgia. CONCLUSÃO: a hidronefrose fetal requer cuidadosa avaliação pós-natal. A estenose da junção pielo-ureteral é a anomalia mais frequente como causa da hidronefrose, e sua correção cirúrgica tem indicações precisas. O protocolo aplicado foi útil em diferenciar pacientes que não necessitaram cirurgia para tratamento da estenose da JUP.(AU)

Study of hepatocellular function in the murine model following hepatic artery selective clamping

PURPOSE: To investigate the impact of selective hepatic artery clamping (SHAC) in hepatocellular function. METHODS: Three groups of Wistar male rats were subjected to SHAC ischemia period of 60min: Group A continuous SHAC were subjected to SHAC ischemia period of 60min, Group B intermittent SHAC of 30min with 5min of reperfusion and Group C intermittent SHAC of 15min with 5min of reperfusion. Animals without SHAC were included-Group D. To evaluate hepatocellular function blood markers and hepatic extraction function (HEF) using 99mTc-mebrofenin were performed before and after surgery. Flow cytometry was used to analyze oxidative stress and cell viability. RESULTS: A mortality rate of 7.6% in Group A was observed. HEF maintained normal values between the groups. Flow cytometry demonstrated no significant differences between the groups in viability, type of cell death as well as in the production of reactive oxygen species. CONCLUSIONS: The selective hepatic artery clamping compared to other clamping techniques results on increased cell viability and decreased hepatocyte death. The SHAC is a potential alternative to decrease per-operative bleeding while maintaining hepatocellular function.(AU)

Scintigraphy in postoperative follow-up of osteosynthesis of the femur with a bridge plate associated with an intramedullary pin in rabbits / Cintilografia no acompanhamento pós-operatório de osteossíntese do fêmur com placa em ponte associada ao pino intramedular em coelhos

The objective of this work was to monitor the consolidation of the femur after osteosynthesis with a bridge plate associated with the intramedullary pin using scintigraphy. We used seven New Zealand breed male rabbits, at 4 months of age, with a mean weight of 3.5 kg. We performed a three-phase bone scintigraphy with technetium-labeled methylene diphosphonate (99mTc-MDP) before and after surgery, and 20, 50 and 90 days postoperatively. The activity index (AI) was calculated by dividing the average number of uptake counts in the region of the osteotomy by the average number of counts in the corresponding region in the contralateral limb. Radiography was performed before surgery, after surgery, and 15, 30, 45, 60 and 90 days postoperatively. We found a direct relationship between the activity index and progress of bone scintigraphy in the evaluation sequence over the period of observation. Scintigraphy allows monitoring of bone metabolism and measurement of vascularization and/or bone or tissue perfusion. The images obtained in the blood pool and static phases are the most appropriate for assessing bone metabolism in the context of this study. The bridge plate associated with the intramedullary pin promotes osteosynthesis with sufficient stability to allow bone consolidation.(AU)

A cintilografia foi empregada no acompanhamento da consolidação de osteotomia experimental do fêmur após osteossíntese com placa em ponte associada ao pino intramedular. Foram usados sete coelhos machos, raça Nova Zelândia, com massa corporal de 3,5kg e idade média de quatro meses. A cintilografia óssea trifásica com metilenodifosfonato marcado com tecnécio-99m (MDP-99mTc) foi obtida antes e após a cirurgia, e nos dias 20, 50 e 90 do pós-operatório.O índice de atividade (IA) foi calculado por meio do quociente da média do número de contagens na região da osteotomia pela média do número de contagens na região correspondente, no membro contralateral normal. Paralelamente ao estudo cintilográfico, foram realizadas radiografias antes dos procedimentos cirúrgicos e aos 15, 30, 45, 60 e 90 dias após, para acompanhamento do processo de cura óssea. Encontrou-se relação direta entre o índice de atividade e a evolução do processo de consolidação óssea na avaliação cintilográfica sequencial ao longo do período de observação. A cintilografia óssea trifásica permite acompanhar o metabolismo ósseo, avaliar e mensurar a vascularização e perfusão tecidual. As imagens obtidas na fase de pool sanguíneo e na fase óssea são as mais adequadas para avaliação do metabolismo ósseo. A placa em ponte associada com o pino intramedular promove osteossíntese com estabilidade suficiente para permitir a consolidação ossea.(AU)

Autoimplante esplênico em cães: revisão de literatura / Splenic autograft: literature review / Autoimplantación esplénica: revisión de la literatura

O baço possui importantes funções, principalmente imunológicas e hematológicas, despertando o interesse em sua manutenção quando uma esplenectomia total é inevitável. O autoimplante esplênico surge como única alternativa para manter essas funções, sendo uma cirurgia de fácil e rápida realização, mas pouco difundida no meio veterinário. A técnica do autoimplante consiste na fragmentação do tecido esplênico e inserção no grande omento, que tem sido considerado o melhor sítio de implantação. Em grande parte dos estudos, o enxerto regenera macroscopicamente e microscopicamente e apresenta funcionalidade. A avaliação da atividade esplênica é realizada através de exames indiretos e cintilografia, que podem demonstrar a função do baço autoimplantado. Essa técnica impede em parte as complicações que ocorreriam em um paciente esplenectomizado, destacando-se a suscetibilidade às infecções após a esplenectomia.(AU)

The spleen has important functions, especially immunologic and hematologic, arousing interest in maintaining them when a total splenectomy is inevitable. Splenic autograft comes up as the only alternative to keep these functions, being an easy and quick surgery but little spread among veterinarians. The technique of autograft consists on fragmentation of splenic tissue and insertion in the greater omentum, which has been considering the best deployment site. In most studies, autograft regenerates macroscopically and microscopically and presents functionality. The splenic activity evaluation is performed through indirect tests, and scintigraphy, which can demonstrate the function of spleen autograft. This technique partly prevents complications that would occur in a splenectomized patient, especially the susceptibility to infections after splenectomy.(AU)

El bazo tiene funciones importantes, especialmente inmunológica y hematológica despertando el interés en su mantenimiento cuando una esplenectomía total es inevitable. El autotrasplante esplénico surge como la única alternativa para mantener estas funciones, es una rápida y fácil operación, pero poco extendida entre los veterinarios. La técnica de autoimplantación consiste en la fragmentación de tejido esplénico y la inserción en el epiplón mayor, que se considera el mejor lugar de implantación. En gran parte del estúdios, el tejido esplénico regenera sus características macroscópicas y microscópicas y se muestra la funcionalidad. La evaluación de la actividad del bazo se lleva a cabo través de pruebas indirectas y la gammagrafía, que puedan demostrar la función del bazo autoimplantado. Esta técnica evita en parte las complicaciones que se producen en un paciente esplenectomizado, especialmente la susceptibilidad a infecciones después de la esplenectomía.(AU)

Autoimplante esplênico em cães: revisão de literatura / Splenic autograft: literature review / Autoimplantación esplénica: revisión de la literatura

O baço possui importantes funções, principalmente imunológicas e hematológicas, despertando o interesse em sua manutenção quando uma esplenectomia total é inevitável. O autoimplante esplênico surge como única alternativa para manter essas funções, sendo uma cirurgia de fácil e rápida realização, mas pouco difundida no meio veterinário. A técnica do autoimplante consiste na fragmentação do tecido esplênico e inserção no grande omento, que tem sido considerado o melhor sítio de implantação. Em grande parte dos estudos, o enxerto regenera macroscopicamente e microscopicamente e apresenta funcionalidade. A avaliação da atividade esplênica é realizada através de exames indiretos e cintilografia, que podem demonstrar a função do baço autoimplantado. Essa técnica impede em parte as complicações que ocorreriam em um paciente esplenectomizado, destacando-se a suscetibilidade às infecções após a esplenectomia.

The spleen has important functions, especially immunologic and hematologic, arousing interest in maintaining them when a total splenectomy is inevitable. Splenic autograft comes up as the only alternative to keep these functions, being an easy and quick surgery but little spread among veterinarians. The technique of autograft consists on fragmentation of splenic tissue and insertion in the greater omentum, which has been considering the best deployment site. In most studies, autograft regenerates macroscopically and microscopically and presents functionality. The splenic activity evaluation is performed through indirect tests, and scintigraphy, which can demonstrate the function of spleen autograft. This technique partly prevents complications that would occur in a splenectomized patient, especially the susceptibility to infections after splenectomy.

El bazo tiene funciones importantes, especialmente inmunológica y hematológica despertando el interés en su mantenimiento cuando una esplenectomía total es inevitable. El autotrasplante esplénico surge como la única alternativa para mantener estas funciones, es una rápida y fácil operación, pero poco extendida entre los veterinarios. La técnica de autoimplantación consiste en la fragmentación de tejido esplénico y la inserción en el epiplón mayor, que se considera el mejor lugar de implantación. En gran parte del estúdios, el tejido esplénico regenera sus características macroscópicas y microscópicas y se muestra la funcionalidad. La evaluación de la actividad del bazo se lleva a cabo través de pruebas indirectas y la gammagrafía, que puedan demostrar la función del bazo autoimplantado. Esta técnica evita en parte las complicaciones que se producen en un paciente esplenectomizado, especialmente la susceptibilidad a infecciones después de la esplenectomía.

Neovascularization after ischemic injury: evaluation with 99mTc-HYNIC-RGD / Neovascularizacao apos lesao isquemica: avaliacao com 99mTc-HYNIC-RGD

Purpose: Angiogenesis involves many mediators including integrins, and the tripeptide RGD is a target amino acid recognition sequence for many of them. Hindlimb ischemia is a simple and convenient animal model however standardization of the injection procedures in the devascularized and control limb is lacking, thus rendering difficult the interpretation of results. The aim of this investigations was to evaluate neovascularization in a hindlimb murine model by means of 99mTc-HYNIC-ß-Ala-RGD. Methods: 99mTc-HYNIC-RGD analog was prepared using coligands. Ischemia was induced in Wistar rats by double- ligation of the common femoral artery. Radiolabeled RGD was injected after 2h, as well as 1, 3, 5, 7, 10 and 14 days. Uptake was evaluated by planar imaging and biodistribution studies. Results: The highest ratio between ischemia and control was achieved at the 7th day (2.62 ± 0.95), with substantial decrease by the 14th day. For pertechnetate the 7th day ratio was 0.87 ± 0.23. Scintigraphic image confirmed different uptakes. Conclusion: 99mTc-HYNIC-RGD analog concentrated in ischemic tissue by the time of widespread angiogenesis and pertechnetate confirmed reduction in blood flow. In this sense, the protocol can be recommended for ischemic models. (AU)

Objetivo: A angiogênese em resposta a fenômenos isquêmicos envolve vários mediadores como as integrinas, sendo que o tripeptídeo RGD possui uma seqüência de aminoácidos com reconhecimento para este alvo. O modelo animal de isquemia de pata traseira é simples e conveniente, porém não há uma padronização do procedimento de injeção e controle radioisotópico em membro desvascularizado, dificultando, portanto a interpretação de resultados. O objetivo deste estudo foi avaliar a neovascularização em modelo murino de isquemia de pata traseira através do radiotraçador 99mTc-HYNIC-ß-Ala-RGD. Métodos: O análogo 99mTc-HYNIC-RGD foi preparado usando coligantes. A isquemia foi induzida em ratos Wistar por dupla-ligação da artéria femoral comum na prega inguinal. Peptídeo RGD radiomarcado foi injetado após 2h, assim como 1, 3, 5, 7, 10 e 14 dias. A captação foi avaliada por imagem planar e estudos de biodistribuição. Resultados: A maior diferença de captação entre isquemia e pata controle foi obtida no 7o dia (2,62 ± 0,95), com decréscimo acentuado no 14o dia. Para o pertecnetato a razão no 7o dia foi 0,87 ± 0,23. A imagem cintilográfica confirmou as diferentes captações. Conclusões: O análogo 99mTc-HYNIC-RGD concentrou-se no tecido isquêmico na etapa em que a angiogênese é mais acentuada, e o estudo do pertecnetato confirmou a redução no fluxo sanguíneo. Desta maneira, este protocolo diagnóstico pode ser recomendado para modelos isquêmicos. (AU)

Effect of sildenafil in renal ischemia/reperfusion injury in rats / Efeito do sildenafil na lesão renal por isquemia/reperfusão em ratos

PURPOSE: To evaluate the effect of sildenafil, administered prior to renal ischemia/reperfusion (I/R), by scintigraphy and histopathological evaluation in rats. METHODS: Twenty-four rats were divided randomly into two groups. They received 0.1 ml of 99mTechnetium-etilenodicisteine intravenous, and a baseline (initial) renal scintigraphy was performed. The rats underwent 60 minutes of ischemia by left renal artery clamping. The right kidney was not manipulated. The sildenafil group (n=12) received orally 1 mg/kg of sildenafil suspension 60 minutes before ischemia. Treatment with saline 0.9 percent in the control group (n=12). Half of the rats was assessed after 24 hours and half after seven days I/R, with new renal scintigraphy to study differential function. After euthanasia, kidneys were removed and subjected to histopathological examination. For statistical evaluation, Student t and Mann-Whitney tests were used. RESULTS: In the control group rats, the left kidneys had significant functional deficit, seven days after I/R, whose scintigraphic pattern was consistent with acute tubular necrosis, compared with the initial scintigraphy (p<0.05). Sildenafil treatment resulted in better differential function of the left kidneys 24h after reperfusion, compared with controls. Histopathologically, the left kidney of control rats (24 hours after I/R) showed a higher degree of cellular necrosis when compared with the sildenafil treated rats (p<0.05). CONCLUSION: Sildenafil had a protective effect in rat kidneys subjected to normothermic I/R, demonstrated by scintigraphy and histomorphometry.(AU)

OBJETIVO: Estudar o efeito do sildenafil, administrado previamente à isquemia/reperfusão (I/R) renal, em avaliações cintilográficas e histopatológicas em ratos. MÉTODOS: Vinte e quatro ratos Wistar foram aleatoriamente distribuídos em dois grupos. Os animais receberam 0,1 ml IV de 99mTecnécio-Etilenodicisteína, foram submetidos à cintilografia renal inicial e em seguida submetidos a isquemia no rim esquerdo, com oclusão da artéria renal, durante 60 minutos, com posterior reperfusão. O grupo sildenafil (n=12) recebeu previamente 1mg/kg de sildenafil em suspensão 60 minutos antes da isquemia. Solução salina 0,9 por cento foi administrada no grupo controle (n=12). Metade dos animais de cada grupo foi avaliada após 24 horas e a outra metade após sete dias de reperfusão, com nova cintilografia renal. Após eutanásia, os rins foram retirados e submetidos a exame histopatológico. Na avaliação estatística foram empregados os testes t de Student e de Mann-Whitney. RESULTADOS: Foi observado no rim esquerdo (submetido a I/R) do grupo controle déficit funcional diferencial nas imagens cintilográficas após sete dias, com padrão de necrose tubular aguda, quando comparado com a cintilografia inicial (p<0,05). O tratamento com sildenafil resultou em melhor função diferencial do rim esquerdo 24h após reperfusão, comparado com os controles. Na histopatologia, os rins esquerdos dos animais do grupo controle (24 horas pós-I/R), apresentaram maior grau de necrose celular quando comparados com o grupo tratado com o sildenafil (p<0,05). CONCLUSÃO: O sildenafil teve efeito protetor em rins de ratos submetidos à isquemia/reperfusão normotérmica, demonstrado por cintilografia e histomorfometria.(AU)

Biodistribution of technetium-99m pertechnetate after Roux-en-Y gastric bypass (Capella technique) in rats / Biodistribuição de tecnécio-99m pertecnetato após desvio gástrico em Y de Roux (técnica de Capella) em ratos

PURPOSE: The biodistribution of sodium pertechnetate, the most used radiopharmaceutical in nuclear medicine, has not been studied in details after bariatric surgery. The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) in organs and tissues of rats. METHODS: Twelve rats were randomly divided into two groups of 6 animals each. The RYGB group rats were submitted to the Roux-en-Y gastric bypass and the control group rats were not operated. After 15 days, all rats were injected with 0.1mL of Na99mTc- via orbital plexus with average radioactivity of 0.66 MBq. After 30 minutes, liver, stomach, thyroid, heart, lung, kidney and femur samples were harvested, weighed and percentage of radioactivity per gram ( percentATI/g) of each organ was determined by gama counter Wizard Perkin-Elmer. We applied the Student t test for statistical analysis, considering p<0.05 as significant. RESULTS: Significant reduction in mean percentATI/g was observed in the liver, stomach and femur in the RYGB group animals, compared with the control group rats (p<0.05). In other organs no significant difference in percentATI/g was observed between the two groups. CONCLUSION: This work contributes to the knowledge that the bariatric surgery RYGB modifies the pattern of biodistribution of Na99mTc-.(AU)

OBJETIVO: Avaliar o efeito da cirurgia de desvio gástrico em Y de Roux (BGYR) na biodistribuição do pertecnetato de sódio (Na99mTc) em órgãos e tecidos de ratos. MÉTODOS: Doze ratos Wistar foram aleatoriamente distribuidos em dois grupos de seis animais cada. O grupo BGYR foi submetido a técnica cirúrgica do desvio gástrico em Y de Roux e o grupo controle não foi operado. No 15º dia de pós-operatório foi administrado 0,1 ml IV de Na99mTc aos animais dos dois grupos, com atividade radioativa média de 0,66MBq. Após 30 minutos os ratos foram mortos e retirados fragmentos de fígado, estômago, tireóide, coração, pulmão, rim e fêmur. As amostras foram lavadas com solução salina 0,9 por cento pesadas e submetidas ao Contador Gama 1470, WizardTM Perkin-Elmer para se determinar o percentual de atividade radiotiva por grama ( por centoATI/g) de cada órgão. Empregou-se o teste t de Student para análise estatística, considerando p<0,05 como significante. RESULTADOS: Redução significante na média de por centoATI/g foi observada no fígado, estômago e fêmur nos animais submetidos a cirurgia de BGYR comparado com o grupo controle (p<0,05). Nos demais órgãos não houve diferença significante no por centoATI/g entre os dois grupos. CONCLUSÃO: A cirurgia BGYR em ratos modificou a biodistribuição do Na99mTc em alguns órgãos, podendo ter implicações clínicas na interpretação de exames cintilográficos.(AU)

Uso da 99mTc-Timina na identificação de metástases de tumor venéreo transmissível canino com apresentação cutânea / The use of 99mTc-Thymine to identify metastatic disease in dogs presenting the cutaneous form of canine transmissible venereal tumor

O tumor venéreo transmissível canino (TVTC) é descrito na literatura como raramente metastático. Entretanto, métodos acurados para verificação dessa afirmativa não estão disponíveis na rotina veterinária. Neste trabalho utilizou-se a cintilografia com 99mTc-Timina para avaliar a disseminação do TVTC com apresentação cutânea. Houve captação da 99mTc-Timina nos três casos de TVTC estudados. A cintilografia com 99mTc-Timina é uma técnica não-invasiva e promissora para a avaliação do grau de disseminação tumoral em casos de TVTC. Sugerimos o seu uso na Oncologia Veterinária para localização de TVTC.(AU)

The venereal canine transmissible tumor (VCTT) is described in literature as a rare metastatic tumor. However accurate methods for verification of this affirmative are not available in the veterinary medicine routine. In this study, we evaluated the dissemination from VCTT with cutaneous presentation using the 99mTc-Thymine scintigraphy. The labelled thymine was uptaken by the three cases of VCTT. 99mTc-Thymine is a promising imaging technique for non-invasive veterinarian evaluation of tumoral dissemination degree decurrent from the VCTT cases.(AU)