Fluid-fluid levels in bone tumours

Dr Aditya Shetty et al.

Fluid-fluid levels in bone tumours is a commonly encountered finding, both in benign as well as malignant bone tumours, and can be used to differentiate between the two.

Method of assessment

On the sagittal T2W image:

  1. measure the length of the largest fluid-fluid level (A)
  2. measure the maximum length of the tumour (B)
  3. calculate A/B ratio

Inference

  • an A/B ratio >41.5 means the tumour is more likely to be benign
  • an A/B ratio <41.5 means the tumour is more likely to be malignant 

Rationale

The rationale behind this unique method of assessment is that areas of necrosis in a malignant tumour are more likely to result in multiple small fluid-fluid levels as compared to a benign tumour.

See also

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Article Information

rID: 42596
Section: Approach
Tag: stub
Synonyms or Alternate Spellings:
  • Asssesing fluid-fluid levels in bone tumours
  • Fluid-fluid levels in bone tumors

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