Abdominal CT scan showed a well-delineated, low-density area that exhibited heterogeneous contrast enhancement. The area measured about 20 mm in size and was to the left of the aorta at the level of the inferior mesenteric artery. MRI showed a mass with heterogeneous hypointensity on T1-weighted images and heterogeneous hyperintensity on T2-weighted images. PET-CT scan showed slightly increased 18F-fluorodeoxyglucose accumulation within the mass. : Retroperitoneal ectopic thyroid tissue
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