Retroperitoneal malignant cyst. Case report.
Forty years after removal of a benign mucinous cyst from the left retroperitoneal space, a malignant cyst with both sarcomatous and carcinomatous components was removed from the same site in a 75-year-old woman. Within 6 months the lesion recurred as a carcinoma penetrating the left colon and the abdominal wall.
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