Abstract

Introduction:The Technetium-99m diethylene triamine pentaacetic acid (Tc-99m DTPA) renal dynamic scintigraphy is widely used to evaluate the split renal function and continuously demonstrate the whole urinary collecting system. Furthermore, the extrarenal uptake of technetium-99m DTPA can provide useful information for the patients.Case presentation:We described a 72-year-old male with a history of flank pain for 8 months and gross hematuria for 3 days. The technetium-99m diethylenetriaminepenta-acetic acid (DTPA) renal dynamic scintigraphy was performed to evaluate the split renal function. Unexpectedly, there were 2 foci of abnormal increased tracer uptake in the midline of the abdomen. The diagnosis of renal cancer was made on the basis of the imaging characteristics on the ultrasonography. The 2 foci with elevated DTPA activity were consistent with bone metastases on the images of computed tomography and magnetic resonance.Conclusion:The bone metastasis is one of the etiologies of the extrarenal uptake of technetium-99m DTPA, especially for the patients with several foci.

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