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mri cong huong tu ct cdha cot song ³¦µ¨³ó²¹ cht sa sut tri tue not don doc solitary nodule clvt nodules fatty lesion sau phuc mac ton thuong chua mo retroperitoneal lesion perihepatic spaces khoang quanh gan diagnostic imaging cat lop vi tinh hepatic deseases ultrasound benh ly gan sieu am u gan