How far can Reidel's lobe extend?

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Reidel's lobe is a normal variant where a tongue-like extension of the right hepatic lobe projects downward. This inferior extension can reach the level of the iliac crest, which marks the lower boundary of the liver’s typical safe extension in this variant. The xiphoid process sits high at the lower sternum, the umbilicus lies around the mid-abdomen (roughly L3–L4), and the pubic symphysis is at the pelvic level — none of these indicate where Reidel's lobe ends. So, the best answer is that Reidel's lobe can extend to the iliac crest.