Extensive myxoid change in well-differentiated papillary mesothelioma of the pelvic peritoneum.

We present a unique case of papillary mesothelioma of the pelvic peritoneum with extensive myxoid change in a 44-year-old woman. The patient presented with lower abdominal pain; imaging studies revealed a pelvic mass. Microscopic examination of the surgically resected specimen showed extensive areas of myxoid stroma and only focal areas of classical papillary mesothelioma. A small biopsy of this lesion might have been misinterpreted as a soft tissue neoplasm with myxoid stroma or pseudomyxoma peritonei. It is suggested that mesothelioma with myxoid change should be included with differential diagnoses of myxoid lesions of the peritoneum. Copyright 2002, Elsevier Science (USA). All rights reserved.