Medial iliac lymph node as a target for metastasis in bitches with malignant mammary neoplasms/Linfonodo iliaco medial como alvo de metastase em cadelas com neoplasmas mamarios malignos

The regional lymphatic connections of the mammary glands in canines are poorly investigated, both in healthy animals and in those with mammary neoplasms. The objective was to establish the occurrence of metastases in the medial iliac lymph nodes (MILN) in bitches with mammary neoplasm, in addition t...

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Published inCiência rural Vol. 54; no. 8; p. 1
Main Authors Feranti, Joao Pedro Scussel, Coradini, Gabriela Pesamosca, Linhares, Marcella Teixeira, Campos, Rammy Vargas, Gavioli, Felipe Baldissarella, Antunes, Bernardo Nascimento, de Oliveira, Marilia Teresa, Brun, Mauricio Veloso
Format Journal Article
LanguageEnglish
Published Universidade Federal de Santa Maria 01.08.2024
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Summary:The regional lymphatic connections of the mammary glands in canines are poorly investigated, both in healthy animals and in those with mammary neoplasms. The objective was to establish the occurrence of metastases in the medial iliac lymph nodes (MILN) in bitches with mammary neoplasm, in addition to evaluating the effectiveness of the technique of lymphatic labeling of the MILN, administering methylene blue (MB) dye intrauterinely or intradermally. Thirty-two bitches with tumors in different mammary glands were included in the study. In 13 bitches (GU group), the MILNs were stained with intrauterine MB, followed by unilateral lymphadenectomy, ovariohysterectomy (OVH) and unilateral mastectomy. Nineteen bitches (GI group) underwent OVH, followed by MILN staining with intradermal MB, lymphadenectomy, and unilateral mastectomy. In GU, 11 bitches (84.62%) exhibited MB-stained MILNs, but staining was not observed in two (15.38%). Metastasis to MILNs was observed in three bitches (9.38%) from the GI and two (6.25%) from the GU. Intrauterine and intradermal staining of MILNs in bitches with mammary tumors was efficient, but intradermal administration of MB produced better results. Given metastatic spread to MILNs in approximately 15.63% of patients, we recommend that screening for MILNs should be considered as part of the staging of animals with malignant mammary neoplasms. Key words: cancer, canine, lymphadenopathy, mammary neoplasms, methylene blue. As conexões linfáticas regionais das glândulas mamárias em caninos são pouco investigadas, tanto em animais sadios quanto naqueles com neoplasmas mamários. Objetivou-se estabelecer à ocorrência de metástases nos linfonodos ilíacos mediais (MILN) em cadelas com neoplasma mamário, além de avaliar a eficácia da técnica de marcação linfática dos MILN, administrando o corante azul de metileno (MB) por via intrauterina ou intradérmica. Trinta e duas cadelas com neoplasmas malignos em diferentes glândulas mamárias foram incluídas no estudo. Em 13 cadelas (grupo GU), os MILNs foram corados com MB intrauterino, seguido de linfadenectomia unilateral, ovariohisterectomia (OVH) e mastectomia unilateral. Dezenove cães (grupo GI) foram submetidos a OVH, seguido de coloração MILN com MB intradérmico, linfadenectomia e mastectomia unilateral. No GU, 11 cães (84,62%) exibiram MILNs corados com MB, mas a coloração não foi observada em dois (15,38%). Metástases para MILNs foi observada em três cães (9,38%) do GI e em dois do GU (6,25%). A coloração intrauterina e intradérmica de MILNs em cadelas com tumores mamários foi eficiente, mas a administração intradérmica de MB produziu melhores resultados, observando a coloração de 100% dos linfonodos no GI e 84,62% no GU. Dada a disseminação metastática para MILNs em aproximadamente 15,63% dos pacientes, recomendamos que a investigação dos MILNs deve ser considerada como parte do estadiamento de animais com neoplasmas mamários malignos. Palavras-chave: câncer, caninos, linfadenopatia, neoplasmas mamários, azul de metileno.
ISSN:0103-8478
1678-4596
DOI:10.1590/0103-8478cr20220501