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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.