A Case of Multicystic Peritoneal Mesothelioma

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Multicystic peritoneal mesothelioma is a very rare tumor and its histochemical findings are similar to the cystic lymphangioma. It is hard to differentiate them by macroscopic and usual microscopic findings. Histochemical, immunochemical and electron microscopic studies are needed to get differential diagnosis.In this paper, we report the first case of multicystic peritoneal mesothelioma in Japan. A 40-year-old man was admitted to our hospital because of the abdominal distension and a mass. Giant elastic soft tumor was palpable in the right upper quadurant of abdomen. Multicystic tumor was detected by US and CT. It was resected on Oct. 25, 1989. The tumor was 20×14×7 cm in size and arised in the greater omentum. Clear and serous fluid was filled in multilocular spaces in this tumor and jelled nodles were recognized in some places. It was diagnosed as multicystic peritoneal mesothelioma in pathologic examiantion.The patient has been in good condition and no recurrences can be found during 8 months after operation.