Fluid-fluid levels in bone tumors
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At the time the article was created Aditya Shetty had no recorded disclosures.View Aditya Shetty's current disclosures
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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.
On the sagittal T2W image:
- measure the length of the largest fluid-fluid level (A)
- measure the maximum length of the tumor (B)
- calculate A/B ratio
- 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
The rationale behind this 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.
- 1.Yu H, Cui JL, Cui SJ et-al. Differentiating benign from malignant bone tumors using fluid-fluid level features on magnetic resonance imaging. Korean J Radiol. 2014;15 (6): 757-63. doi:10.3348/kjr.2014.15.6.757 - Free text at pubmed - Pubmed citation