Sonographic appearance of pancreaticoduodenal lymph nodes in dogs and cats
Sonographic heterogeneity of abdominal lymph nodes has been reported as a feature associated with malignancy in dogs:
Vet Radiol Ultrasound. 2007 Nov-Dec;48(6):565-9.
Association between malignancy and sonographic heterogeneity in canine and feline abdominal lymph nodes.
Kinns J1, Mai W.
In that series, 91% of dogs with heterogeneous abdominal nodes proved to have malignancies.
However, the principal pancreaticoduodenal node is an exception to this rule: being consistently heterogeneous in both cats and dogs under normal circumstances.
There appears to be a ‘finger’ of abdominal fat indented into the hilus of the node which creates this appearance.
That’s the kind of ultrasound geekery we love 🙂