Case series of a novel inflammatory bowel disease phenotype (UC2CD) in Mexican patients.

A novel inflammatory bowel disease phenotype, named UC2CD, was recently described and is characterized by the transformation from ulcerative colitis (UC) to the Crohn's disease (CD) phenotype, with distinct clinical, serologic, and genetic features. In our case series, we describe the clinical characteristics of 8 patients presenting with this new phenotype, treated at the Inflammatory Bowel Disease Clinic of the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ).