Claw sign (spine)
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At the time the article was created Hamish Smith had no recorded disclosures.View Hamish Smith's current disclosures
At the time the article was last revised Francis Deng had no recorded disclosures.View Francis Deng's current disclosures
The claw sign on diffusion weighted imaging refers to a pattern of hyperintensity seen in degenerative changes in the spine (Modic type 1): well-defined, paired band-like regions of restricted diffusion affecting two contiguous vertebral bodies, resembling a claw surrounding the disc space on sagittal images. The presence of the claw sign is highly predictive of degeneration 1-3 and has a high negative predictive value against infection 4. In contrast, diffuse or amorphous DWI hyperintensity, absent a claw morphology, predicts infectious spondylodiscitis 1-3.