Clinical Phenotypes and Factors Associated with Systemic Involvement in Pediatric IgA Vasculitis: A Single-Center Study from Southeastern Türkiye

Objective: To characterize clinical phenotypes and laboratory indicators of systemic involvement (gastrointestinal [GI] and renal) in pediatric immunoglobulin A vasculitis (IgAV), focusing on purpura distribution, inflammatory markers, and ultrasonography (USG) findings.Methods: We retrospectively reviewed medical records of 51 children diagnosed with IgAV according to EULAR/PRINTO/PRES 2008 criteria at a tertiary center in Mardin (March 2025–January 2026). Data were analyzed using Chi-square/Fisher’s exact tests for categorical variables and Mann–Whitney U tests for continuous variables.Results: Median age was 6.67 years; 54.9% were male. GI and renal involvement occurred in 41.2% and 43.1%, respectively. Widespread rash (33.3%) significantly correlated with GI (p