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Upper Urothelial Tract Extraosseous Bone Formation: An Unexpected Finding and Differential Diagnostic Considerations.
International Journal of Surgical Pathology 2024 January 32
Extraosseous bone formation of the upper urothelial tract is an unusual phenomenon with limited documentation in the uropathology literature, reported in only 2 clinical series of patients undergoing percutaneous nephrolithotomy for the management of renal stones. While speculations regarding the pathogenesis of this occurrence have been published, heterotopic ossification is still poorly understood. We report the finding of extraosseous bone formation in the renal pelvis of a 30-year-old male patient with a history of kidney stones. Histologic sections of the ureter and renal pelvis showed submucosal nodules of woven bone. Ancillary fluorescence in-situ hybridization studies were negative for MDM2 amplification and USP6 rearrangement.
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