Polka dot sign (vertebral hemangioma)
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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 or the jail bar sign seen on sagittal and coronal images. On CT the dots are white on a black fatty background, whereas on MRI they are black dots on a white background (on non-fat-suppressed T1 or T2-weighted images).
History and etymology
Polka dots refer to a clothing pattern consisting of equally sized and spaced filled circles. It is generally confined to casual wear e.g. bathing suits and lingerie 1.
-<p>The <strong>polka-dot sign</strong> is the result of the replacement of the normal <a href="/articles/cancellous-bone">cancellous bone</a> by thickened vertical trabeculae surrounded by fat marrow or vascular lacunae in vertebral <a href="/articles/primary-intraosseous-haemangioma">intraosseous haemangiomas</a> <sup>2</sup>. It is the axial equivalent of the <a href="/articles/corduroy-sign-vertebral-haemangioma">corduroy sign</a> seen on sagittal and coronal images. On CT the dots are white on a black fatty background, whereas on MRI they are black dots on a white background (on non-fat-suppressed T1 or T2-weighted images).</p><h4>History and etymology</h4><p>Polka dots refer to a clothing pattern consisting of equally sized and spaced filled circles. It is generally confined to casual wear e.g. bathing suits and lingerie <sup>1</sup>. </p>- +<p>The <strong>polka-dot sign</strong> is the result of the replacement of the normal <a href="/articles/cancellous-bone">cancellous bone</a> by thickened vertical trabeculae surrounded by fat marrow or vascular lacunae in vertebral <a href="/articles/primary-intraosseous-haemangioma">intraosseous haemangiomas</a> <sup>2</sup>. It is the axial equivalent of the <a href="/articles/corduroy-sign-vertebral-haemangioma">corduroy sign</a> or the <a title="Jail bar sign (vertebral haemangioma)" href="/articles/jail-bar-sign-vertebral-haemangioma">jail bar sign</a> seen on sagittal and coronal images. On CT the dots are white on a black fatty background, whereas on MRI they are black dots on a white background (on non-fat-suppressed T1 or T2-weighted images).</p><h4>History and etymology</h4><p>Polka dots refer to a clothing pattern consisting of equally sized and spaced filled circles. It is generally confined to casual wear e.g. bathing suits and lingerie <sup>1</sup>. </p>
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