Myeloma defining events (mnemonic)

Last revised by Rohit Sharma on 23 Jul 2024

The myeloma defining events can be recalled using the mnemonics:

  • CRAB

  • SLiM-CRAB

Mnemonics

CRAB
SLiM-CRAB
  • S: sixty percent (60%) bone marrow plasmacytosis

  • Li: light chain involved-to-uninvolved ratio ≥100

  • M: MRI >1 focal lesion

  • C: hypercalcemia

  • R: renal failure

  • A: anemia

  • B: bone disease

The CRAB and SLiM-CRAB mnemonics differentiate multiple myeloma from its precursor diseases - monoclonal gammopathy of undetermined significance (MGUS) and smoldering multiple myeloma 2,3. The SLiM criteria were added to the CRAB criteria of multiple myeloma in 2014 3.

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