Investigators recently uncovered key insights into newly defined rejection entities in kidney transplantation that may offer improved patient risk categorization post-transplant. Kidney transplant rejection continues to threaten the long-term success of kidney transplants, with microvascular inflammation (inflammation within capillaries) playing a pivotal role in graft failure. Due to its complex nature, this inflammation poses a major challenge in clinical practice. In response, the international Banff classification—the global standard for diagnosing transplant rejection—has redefined antibody-mediated rejection diagnostics by introducing two new categories of microvascular inflammation: mild microvascular inflammation with probable antibody-mediated rejection and microvascular inflammation in the absence of antibody-mediated responses....