What is the exception to the liver being covered by peritoneum?

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The liver is mostly covered by peritoneum, but there is a specific patch on its diaphragmatic surface where this covering is absent—the bare area. This region lies where the liver directly contacts the diaphragm and is not enveloped by peritoneum, allowing a direct liver-diaphragm interface that is bounded by the reflections of peritoneum along the coronary ligaments and the falciform ligament. The other features listed are peritoneal structures or spaces: the falciform ligament is a peritoneal fold attaching the liver to the anterior abdominal wall, the round ligament (ligamentum teres) is within that fold, and the porta hepatis is the hepatic hilum on the visceral surface surrounded by peritoneal reflections. Hence, the bare area is the exception.