Magnetic resonance imaging (MRI) of the abdomen and pelvis. The figure shows heterogeneous pockets of fluid collections along the posterior aspect of the transplanted kidney (red arrows), tracking along the lateral aspect into the right anterior pelvic wall (blue arrows), which contains another collection measuring approximately 4 cm x 1.5 cm (yellow arrow), with surrounding extensive inflammatory changes and possible external opening. The non-localized collection posterior to the transplanted kidney measures approximately 4.5 cm x 1.2 cm and demonstrates restricted diffusion suggesting abscess.