AI-generated data contamination erodes pathological variability and diagnostic reliability. - Hongyu He; Shaowen Xiang; Ye Zhang; Yingtao Zhu; Jin Zhang; Hao Deng; Emily Alsentzer; Yun Liu; Qingyu Chen 001; Kun-Hsing Yu; Andrew Marshall; Tingting Chen; et al. (CoRR, 2026)