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An 81-year-old man presented with new-onset right lumbodorsal pain, four years after radical nephrectomy for right renal cell carcinoma. 18 F-FDG PET/CT revealed a high-density focus with intense radioactivity in the midline of the abdomen, corresponding to a urachal calculus. This case highlights the importance of recognizing urachal calculus as a potential false-positive finding in 18 F-FDG PET/CT.
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Jia et al. (2026) studied this question.
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