Polka-dot sign (vertebral haemangioma)

The polka-dot sign is the result of the replacement of the normal cancellous bone by thickened vertical trabeculae surrounded by fat marrow or vascular lacunae in vertebral intraosseous haemangiomas 2. It is the axial equivalent of the corduroy sign seen on sagittal and coronal images. On CT the dots are white on black fatty background, whereas or MR they are black dots on white background (on non-fat-suppressed T1 or T2-weighted images).

Etymology

Polka dots refer to a clothing pattern consisting of equally sized and spaced filled circles. It is generally confined to more playful attire e.g. bathing suits and lingerie 1


Inspired signs
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Article Information

rID: 14682
Section: Signs
Synonyms or Alternate Spellings:

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Cases and Figures

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    Figure 1: polka dot pattern
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    Vertebral haemang...
    Case 1
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    Polka-dot sign
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