Mesenteric lymphadenopathy is only visible on survey radiographs when the lymph nodes are very big. It should be included in the differential diagnosis of an abdominal mass. Ultrasonography Ultrasonography is the modality of choice for evaluation of lymph nodes. Normal medial iliac lymph nodes may be seen in the caudo-dorsal abdomen, at the iliac bifurcation, on each side of the aorta and caudal vena cava. Jejunal lymph nodes may be seen along the mesenteric vein.
All lymph nodes become visible with lymphadenopathy.
Ultrasonography is a much more sensitive modality than survey radiographs for the diagnosis of lymphadenopathy. In addition, fine needle aspiration of the lymph nodes can be attempted with ultrasonographic guidance depending on the size and the location of the lymph nodes.