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Korean J Pathol. 2009 Apr;43(2):182-184. Korean. Case Report.
Kim HS , Joo M , Chang SH , Kwak JE , Shim SH , Cho SY .
Department of Pathology, College of Medicine, Inje University, Goyang, Korea.
Department of Urology, College of Medicine, Inje University, Goyang, Korea.

A 62-year-old man with left flank pain and hematuria was shown to have a staghorn stone in left renal pelvis. Grossly, renal pelvis and calyces were markedly dilated with cystic and hemorrhagic degeneration and renal parenchyma was atrophied. A tumor-like mass was located in a hemorrhagic cyst of the renal upper pole. This mass consisted of giant cells and stromal cells mimicking a giant cell tumor of bone. This giant cell tumor-like proliferation may represent a response to hemorrhage into a cystic cavity. Recognition of this finding is important to avoid the over-diagnosis of neoplastic lesions.

Copyright © 2019. Korean Association of Medical Journal Editors.