Which of the following statements regarding sonographic patterns of periaortic lymph nodes is incorrect?

The correct answer points to the assertion regarding periaortic lymph nodes displacing the superior mesenteric artery posteriorly. This statement is considered incorrect because periaortic lymph nodes, when enlarged, typically exert pressure on nearby anatomical structures, but rather than pushing the superior mesenteric artery posteriorly, they more commonly cause displacement of the artery anteriorly or laterally due to their anatomical positioning.

Periaortic lymph nodes are located along the aorta and can surround or encase the vascular structures in the abdomen. When these nodes enlarge due to conditions such as malignancy or infection, the most common imaging findings include mantling or draping over the vessels or pushing them anteriorly, which aligns with normal anatomical relationships. Understanding the expected sonographic patterns of lymph nodes aids in identifying their characteristics during ultrasound evaluation, which is crucial in assessing potential pathologies in the abdomen.

The other statements about periaortic lymph nodes accurately reflect their potential sonographic appearances and behavior in relation to major vascular structures. A proper grasp of these relationships is essential for interpreting abdominal ultrasound findings and assessing lymphadenopathy.