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White pyramid sign (kidney)

Last revised by Robert Foley on 25 Dec 2021

The white pyramid sign, also known as dense renal medulla sign (DRM) or hyperdense renal pyramids sign, refers to the CT appearance of the medullary pyramids of the kidney which can be seen normally on unenhanced CT scans as high-attenuation triangular structures.

Pathology

Etiology

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Cases and figures

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