Massive Retroperitoneal Hemorrhage as an Initial Presentation of a Rare and Aggressive Form of Multiple Myeloma

<div>Postmortem bone marrow biopsy showing strongly positive Immunohistochemical stain for lambda immunoglobulin light chain within the plasma cell cytoplasm. (The IHC is suboptimal secondary to protein degradation during tissue autolysis in devitalized tissues.)</div>

Case Reports in Hematology

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Figure 4

Figure 4: Massive Retroperitoneal Hemorrhage as an Initial Presentation of a Rare and Aggressive Form of Multiple Myeloma 