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Pesquisa do Linfonodo Sentinela (LS) tem se mostrado efetiva na avaliação axilar nas portadoras de neoplasia mamária. O LS negativo torna desnecessário o esvaziamento axilar. OBJETIVO: Identificar o LS da região subareolar da mama em cadelas utilizando corante azul patente (AP), Tecnécio Tc99m ou a associação de ambas as técnicas e compará-las quanto à sensibilidade na detecção do linfonodo sentinela. MÉTODOS: Foram estudadas dezessete cães fêmeas. Um total de 55 mamas foram analisadas. Utilizou-se AP (2,5%/0,5 ml) e/ou Tc99m (1,0 mC/0,8ml) para identificação do LS. A aplicação do Tc99m era realizada duas horas antes da realização do experimento. O AP era injetado na região subareolar da mama. Localizado o LS, realizava-se sua exérese. RESULTADOS: Dos 44 linfonodos em que se utilizou AP, pôde-se verificar que 40 estavam corados (90,90%). Dos 48 linfonodos em que se utilizou Tc99m, 47 linfonodos estavam radioativos (97,91%) (p=0.18; k= - 0.067). Nas 37 mamas em que se associou AP ao Tc99m, apesar de 02 linfonodos não estarem corados, todos estavam radioativos (AP vs AP+Tc: p=0.12; k=0.083; Tc vs AP+Tc: p=1.0; k=0.018). CONCLUSÃO: O Tc99m e o corante azul patente, isolados ou associados, prestam-se à identificação do LS da mama do animal. The sentinel lymph node research (SLN) has been effective in the evaluation of nodal status in patients with breast cancer. A negative SLN makes an axillary lymphadenectomy unnecessary. PURPOSE: To identify the SLN of the subareolar region in female dog breasts using blue dye (BD), Technetium (Tc99m) or the association of both techniques and to compare their sensibility in the detection of the SLN. METHODS: Seventeen female dogs were studied. 55 breasts were analyzed. DB and/or Tc99m were used for the identification of SLN. Tc99m was introduced two hours before the experiment. BD was introduced some minutes before the procedure. Once the SLN was localized its dissection was performed. RESULTS: From all 44 lymph nodes in which BD was used, 40 were colored (90,90%). Tc99m was used in 48 lymph nodes and 47 of them were radioactive (97,91%) (BD vs Tc99m: p=0.18; k= - 0.067). BD and Tc99mwere associated in 37 lymph nodes, although 02 lymph nodes were not colored, all of them were radioactive (100%)(BD vs BD+Tc99m: p=0.12; k=0.083; Tc99m vs BD+ Tc99m: p=1.0; k=0.018). CONCLUSION: Tc99mand BD isolated or in association, were effective in the identification of the SLN in the female dog breasts studied

Estudo experimental de linfonodo sentinela na mama da cadela com azul patente e Tecnécio Tc99m