A 74-year-old woman who had a history of heart failure presented with abdominal pain for one day. Physically, local tenderness was found at the right upper quadrant of her abdomen. Blood tests revealed a haemoglobin of 11.1 g/dL and a leukocyte count of 5,500/µL (neutrophil 76.2%, lymphocyte 18.9% and monocyte 4%). The liver profile showed an aspartate aminotransferase (AST) of 190 U/L, alanine aminotransferase (ALT) of 112 U/L, and total bilirubin of 0.6 mg/dL. Urinalysis showed neither haematuria nor pyuria. A diagnosis of acute cholecystitis was made based on the abdominal sonographic findings, including an impacted obstructing stone in the neck of the gallbladder, gallbladder wall thickening and a positive sonographic Murphy’s sign. She was hospitalised and received intravenous antibiotic administration. Incidentally, the routine abdominal radiography (Fig. 1) showed a calcified tumour in the pelvis. What is the diagnosis of the pelvic tumour?
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