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Extrarenal Growth of Angiomyolipoma

Recent sonographic screening of internal organs has increasingly found asymptomatic renal masses including angiomyolipoma. Most angiomyolipomas are reported to be growing inside the kidney. Considering the elements which make up the tumor, however, it is not strange to arise from interlobar space and grow outside of the kidney. Two such cases are reported here. In both cases the least aggressive enucleation surgery was successfully carried out.