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Fig. 4. —56-year-old woman with renal cell carcinoma that was
misdiagnosed as angiomyolipoma. Axial opposed-phase T1-weighted MR image
(TR/TE, 167/2.6) shows 8-mm exophytic mass at posterior aspect of right
kidney. India ink artifact (arrow) was identified by observers at
interface of renal mass with kidney, suggesting that mass contains fat and is
angiomyolipoma. Loss of signal at interface of mass and kidney (which has
superficial resemblance to india ink artifact) is thought to be artifactual
and secondary to combination of volume-averaging and "Gibbs"
artifact.
