AI Article Synopsis

  • Two patients with extrarenal retroperitoneal angiomyolipoma were initially misdiagnosed as having perinephric liposarcoma, highlighting the challenges in correctly identifying these types of tumors.
  • Patient 1, a 66-year-old man, had a tumor near the kidney that was tracked for 18 months, leading to surgical removal after its enlargement was noted.
  • Patient 2, a 56-year-old man, was diagnosed through routine ultrasound and underwent surgery based on imaging findings, but both cases ultimately confirmed the presence of extrarenal angiomyolipoma, underscoring the difficulty in distinguishing it from liposarcoma using advanced imaging techniques like 18F-FDG PET/CT

Article Abstract

We report two patients with extrarenal retroperitoneal angiomyolipoma masquerading as perinephric liposarcoma. Patient 1 : A 66-year-old man was diagnosed with a retroperitoneal tumor near the right renal hilum on an abdominal computed tomography (CT) performed before surgery for gastric cancer. A diagnosis of extrarenal retroperitoneal angiomyolipoma was made on the basis of negative uptake of fluorine- 18 2-deoxy-2-fluoro-D-glucose positron emission tomography (18F-FDG PET)/CT. However, because the tumor was found to have gradually enlarged at 18 months afterward, he underwent resection of the extrarenal fat tissue together with the right kidney. Patient 2 : A 56-year-old man underwent abdominal ultrasound during a periodic medical examination, which revealed a right retroperitoneal tumor. Because of the findings in the contrast-enhanced CT and positive uptake of 18F-FDG PET/CT, he underwent resection of the extrarenal fat tissue together with the right kidney. The pathological examination of the two tumors confirmed extrarenal angiomyolipoma. The differential diagnosis of extrarenal retroperitoneal angiomyolipoma from retroperitoneal liposarcoma is difficult even with the use of 18F-FDG PET/CT.

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