What is the sonographic appearance of Reidel's lobe?

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Reidel's lobe is a normal anatomic variant where the right lobe extends downward as a tongue‑like projection. On ultrasound this extension is composed of liver parenchyma with the same echogenicity and texture as the rest of the liver, so it appears indistinguishable from normal liver tissue aside from its elongated shape. It is not a mass, cyst, or a region of altered echogenicity. Distinguishing this variant from a true lesion is important: a focal hyperechoic mass would have different echogenicity and possibly a distinct margin, and a cyst would be anechoic with posterior acoustic enhancement.