SONOGRAPHIC CHARACTERISTICS OF PRESUMPTIVELY NORMAL CANINE MEDIAL ILIAC AND SUPERFICIAL INGUINAL LYMPH NODES

Authors

  • MONIQUE N. MAYER,

    1. Department of Small Animal Clinical Sciences, University of Saskatchewan, 52 Campus Drive Saskatoon, Saskatchewan, Canada S7N 5B4
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  • JOSHUA A. LAWSON,

    1. Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, 103 Hospital Drive Saskatoon, Saskatchewan, Canada S7N 0W8
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  • TAWNI I. SILVER

    1. Department of Small Animal Clinical Sciences, University of Saskatchewan, 52 Campus Drive Saskatoon, Saskatchewan, Canada S7N 5B4
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Address correspondence and reprint requests to Monique N. Mayer, at the above address. E-mail: monique.mayer@usask.ca

Abstract

The medial iliac and superficial inguinal lymph nodes are not routinely palpable in the dog, and ultrasound imaging provides an alternate noninvasive technique to assess these lymph nodes, as well as to guide needle aspiration. Herein we describe the ultrasound characteristics of the medial iliac and superficial inguinal lymph nodes in 50 healthy dogs, as well as frequency and ease of node detection. The relationship between the size of the lymph nodes and the following variables was assessed: age, gender, body weight, body condition score, body length, and thoracic height and width. Right and left medial iliac lymph nodes were detected in 50 (100%) dogs, right superficial inguinal lymph node(s) in 49 (98%) dogs, and left superficial inguinal lymph node(s) in 47 (96%) dogs. In >90% of both sets of lymph nodes, the echogenicity was hypoechoic or isoechoic to surrounding tissues, with a corticomedullary or homogenous echotexture, smooth, clearly defined margins, and a fusiform shape. Increasing weight, distance from the sternal manubrium to the ischium, and thoracic height and width were associated with increased lymph node size (P-values<0.05). Average lymph node sizes and range of sizes provide preliminary reference values for the medial iliac and superficial inguinal lymph nodes in normal dogs.

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