Supplementary Material for: Relapsed IgA multiple myeloma as testicular plasmacytoma after quadrable novel therapy and autologous stem cell transplant. A rare report and literature review

Introduction: Multiple myeloma(MM) is a clonal neoplasm of plasma cells that may manifest as an extramedullary disease in rare cases. Case report: In this case report, we present the rare occurrence of testicular relapse in a 39-year-old patient with IgA multiple myeloma after four years of remission. We discuss the clinical course and management of this unusual presentation and provide a comprehensive literature review of testicular involvement by MM. Conclusion: Despite advances in MM treatment, relapse remains common, highlighting the importance of careful follow-up and timely detection of disease recurrence at atypical sites. This case highlights the need for further research to standardize the diagnosis and treatment of testicular MM.