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Pancreatic transplants: evaluation with MR imaging
W T Yuh1, L G Hunsicker, D D Nghiem
1Department of Radiology, University of Iowa Hospital and Clinic, Iowa City 55242.
Abstract:
Eighty-eight magnetic resonance (MR) imaging studies of 31 pancreas transplants in 30 patients were performed. The postoperative graft usually appears enlarged and inhomogeneous, with patchy areas of increased signal intensity on T2-weighted images that may last 3-4 weeks. During acute rejection, T1-weighted images of graft abnormalities show a decrease in signal intensity, similar to that of muscle, and T2-weighted images show an increase in signal intensity, equal to or higher than that of the bladder. The pattern of abnormal signal is most frequently multifocal but can be diffuse, and the graft may be enlarged. During recovery from rejection, the graft parenchyma shows a decrease in signal intensity (less than that of the bladder) on T2-weighted images when compared with that of acute rejection. During chronic rejection the graft is small and shows low signal intensity, slightly higher than or similar to that of muscle, on both T1- and T2-weighted images. MR imaging appears to be useful for detection of early pancreas allograft rejection and complications in conjunction with clinical findings, laboratory data, and other radiologic procedures.
Insights
Magnetic resonance (MR) imaging helps detect pancreas transplant rejection. MR imaging findings correlate with acute, recovery, and chronic rejection stages, aiding early diagnosis.
Area of Science:
- Radiology
- Transplant Surgery
Background:
- Pancreas transplantation is a life-saving procedure for select patients with type 1 diabetes.
- Monitoring pancreas allograft function and detecting rejection are critical for long-term graft survival.
Purpose of the Study:
- To evaluate the utility of magnetic resonance (MR) imaging in diagnosing pancreas allograft rejection.
- To characterize MR imaging findings associated with different stages of pancreas allograft rejection.
Main Methods:
- Eighty-eight MR imaging studies were performed on 31 pancreas transplants in 30 patients.
- MR imaging sequences included T1-weighted and T2-weighted images.
- Imaging findings were correlated with clinical data and outcomes.
Main Results:
- Postoperative pancreas grafts typically appeared enlarged and inhomogeneous.
- Acute rejection showed decreased T1 and increased T2 signal intensity.
- Chronic rejection was characterized by small grafts with low signal intensity on both T1- and T2-weighted images.
Conclusions:
- MR imaging is valuable for detecting early pancreas allograft rejection.
- MR imaging findings can differentiate between acute, recovery, and chronic rejection phases.
- Combined with clinical and laboratory data, MR imaging aids in managing pancreas transplant recipients.