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New Retroperitoneal Soft-Tissue Lesion in Multiple Myeloma | Synapse

February 14, 2026

New Retroperitoneal Soft-Tissue Lesion in Multiple Myeloma

Key Points

To diagnose a new retroperitoneal soft-tissue lesion in a patient with multiple myeloma.
Case analysis of a 67-year-old male with λ light-chain multiple myeloma
Assessment of serum-free λ light chain levels
Increased serum-free λ light chain levels observed
Indication of a potential new retroperitoneal lesion

Abstract

A 67-year-old man with a history of λ light-chain multiple myeloma presents with increased serum-free λ light chain levels. What is your diagnosis?

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Cite This Study

Gu et al. (Thu,) studied this question.

synapsesocial.com/papers/699010df2ccff479cfe572aa https://doi.org/https://doi.org/10.1001/jamaoncol.2025.6443

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