Fluid-fluid levels in bone tumors

Dr Craig Hacking and Dr Aditya Shetty et al.

Fluid-fluid levels in bone tumors is a commonly encountered finding, both in benign as well as malignant bone tumors, 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 tumor (B)
  3. calculate A/B ratio

Inference

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

Rationale

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

See also

Share article

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

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.