[Mesothelial cyst and cystic mesothelioma of the greater omentum:case report and literature review].

Mesothelial cysts and cystic mesotheliomas of the greater omentum are very rare clinical entities. About 30 cases of mesothelial cysts and only 4 cases of cystic mesotheliomas were described in the world literature so far. Over 13 years period (1987-2000), between 15,000 laparotomised adult patients, we have diagnosed one case of mesothelial cyst and one of cystic mesothelioma only. Mesothelial cyst, 7 cm in diameter, covered by regular mesothelial cells, was found accidently during gaster cancer surgery. In a 78 years old man, 30 cm in diameter cystic mesothelioma was diagnosed with immunohistochemical studies, necessarily for differentiation between cystic mesothelioma and other peritoneal cysts. Due to possible aggressive course at the diseases and tendency to recurrency, a complete surgical excision and log term follow-up are necessary.