: GREFFE\_ELASTO IRM will evaluate Magnetic Resonance Elastography (MRE) in renal transplant patients with suspected interstitial fibrosis/tubular atrophy lesions requiring biopsy graft sampling under ultrasound control. The main objective is to search a correlation between renal graft parenchymal elasticity values obtained in vivo by MRE, and the histological data of renal fibrosis by biopsy sampling, and providing a non-invasive tool capable of detecting and monitoring this development over time, making possible in the future to reduce the number of renal biopsies.
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Mean value of renal elasticity
Timeframe: Baseline (defined as during MRE exam)