A 44-year-old woman who initially presented with vague abdominal pain was found to have an abdominal mass for which she underwent a right hemicolectomy. The 20.0 cm cystic mass involved the external surfaces of the ileum, appendix and small portion of attached omentum. The cystic spaces were lined by calretinin-positive, D2-40-positive cells.
The master list with the correct answer
• Florid cystic endosalpingiosis
• Malignant peritoneal mesothelioma
• Multicystic peritoneal mesothelioma
• Pseudomyxoma peritonei
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• Appropriate diagnosis
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