A rare presentation and treatment challenges for multiple myeloma in down syndrome: A case report and literature review.

Key Clinical Message: Down syndrome (DS), characterized by trisomy 21, significantly increases susceptibility to leukemia, although the occurrence of multiple myeloma (MM) in DS is exceedingly rare. This report details the case of a 45‐year‐old female with DS who was diagnosed with MM, highlighting diagnostic and therapeutic complexities. It emphasizes the importance of tailored therapeutic strategies for treating MM in individuals with DS and the need for specialized approaches in these cases. [ABSTRACT FROM AUTHOR]