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From question on page 478
At laparotomy, a massive mesenteric cyst was found and fully excised. It contained 900 ml of creamy fluid and three calculi. Surprisingly, pathology demonstrated an inflammatory cyst arising from within the omentum, lined by granulation tissue, and the largest calculus had the microscopic appearance of a gall stone. There was no evidence of malignant cells in the specimen. The patient fully recovered from surgery and remains without evidence of recurrence of malignancy.
This remarkable finding conceivably relates to perforation of the cystic duct by a gall stone which had resided within the omentum for more than 10 years and formed the massive mesenteric cyst.