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Review Question - QID 213402

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QID 213402 (Type "213402" in App Search)
A 73-year-old man is found to have an early stage hepatocellular carcinoma in the left lobe of his liver. He decides to undergo surgery to remove the tumor through partial liver resection. During the procedure, a ligament is found that attaches the liver to the anterior abdominal wall. Since part of this ligament lies over the part of the liver that needs to be resected, the ligament is incised to allow for removal of the tumor. The free edge of the ligament is found to have a thickening with small remnant blood vessels. Which of the following embryonic structures most likely gave rise to the thickening described here?