What is Reidel's lobe?

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Reidel's lobe is a normal anatomical variant of the liver where the right lobe has a tongue-like extension that projects inferiorly. This downward projection arises from the inferior border of the right lobe and can extend toward the lower abdomen or right iliac region. It is not a left-lobe extension, nor a posterior projection of the caudate lobe, and it isn’t a memory phenomenon. On imaging, this downward extension can mimic hepatomegaly or a mass, but it remains continuous with the right lobe, confirming it as part of the liver.