Case Report: A classical PSGN case with unusually prominent serosal manifestations and complement patterns that mimicked systemic autoimmune disease—highlighting diagnostic pitfalls and biopsy decision-making

This case underscores an unusual presentation of PSGN with serosal involvement-a manifestation reported only sporadically in literature. Recognition of such rare systemic features is crucial to avoid diagnostic delays or unnecessary immunosuppression. Supportive care alone led to favorable outcomes, reinforcing the self-limited nature of PSGN even in atypical presentations. It serves as a valuable reminder that atypical PSGN can present with multi-system inflammation, and a precise diagnostic approach integrating serology and clinical course is essential to avoid unnecessary intervention.