Answer: B, Tubulitis
All of the provided answers are used to diagnose antibody mediated rejection, except for tubulitis. Tubulitis is needed for diagnosis of T-cell mediated rejection. For more information on the Banff classification system, see the reference below.
References
Loupy A, Haas M, Roufosse C, et al. The Banff 2019 Kidney Meeting Report (I): Updates on and clarification of criteria for T cell– and antibody-mediated rejection. Am J Transplant. 2020; 00: 1–14.
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