Epithelial mesothelioma with deciduoid features

A rare case of malignant mesothelioma in a 15-year-old girl is described. T he patient presented with secondary amenorrhoea and clinical symptoms resem bling those of an ovarian cyst. One large and multiple small peritoneal nod ules were found at laparoscopy. Histologically the tumour was characterised by an unusual pattern with a superficial resemblance to decidual reaction, but because of significant mitotic activity the diagnosis of a malignant t umour, epithelial mesothelioma with deciduoid features, was made. The patie nt died 11 months after diagnosis. Post-mortem examination revealed extensi ve extraperitoneal spread.