title: Acute renal rejection versus acute tubular necrosis in a canine model: MR evaluation.
abstract: Findings of magnetic resonance (MR) imaging in acute renal rejection and acute tubular necrosis (ATN) were studied in dogs. On T1-weighted images, corticomedullary differentiation was absent in kidneys undergoing acute rejection. The loss of corticomedullary differentiation in these kidneys was secondary to a decrease in the relative signal intensity of the cortex, indicating prolongation of the T1 relaxation time of the cortex. In contrast, corticomedullary differentiation was preserved on T1-weighted images of autotransplanted kidneys and kidneys with ATN. MR imaging findings correlated with changes in water content in these three groups of kidneys. Kidneys undergoing acute rejection showed a marked increase in water content compared with kidneys in the other two groups. No change in fat content was found in any group.
mesh_terms: D058186:Acute Kidney Injury / Q000175:diagnosis*; D000818:Animals; D001834:Body Water / Q000032:analysis; D004285:Dogs; D006084:Graft Rejection; D007672:Kidney Cortex / Q000473:pathology; D007679:Kidney Medulla / Q000473:pathology; D016030:Kidney Transplantation; D007683:Kidney Tubular Necrosis, Acute / Q000175:diagnosis*; D009682:Magnetic Resonance Spectroscopy