A Case of Retroperitoneal Desmoid-Type Fibromatosis that Invaded Skeletal Muscle after Left Hepatectomy and Cholecystectomy

Case presentation: A 52-year-old woman visited a hospital and a physical examination revealed retroperitoneal mass that had been present for more than 1 month. Three years prior, left hemangioma of the liver was treated with left hepatectomy and cholecystectomy. The physical examination revealed no abdominal pain, abdominal distension, acid reflux heartburn, vomiting or other symptoms. The results of the laboratory examination were as follows: blood potassium concentration (3.01 mmol/L), blood magnesium concentration (0.54 mmol/L), and urinary calcium concentration (0.34 mmol/24h). Routine blood work, tumor markers, and blood coagulation test results were generally normal.