Claw Sign or Beak Sign

Abstract

In cases when some masses or cysts grow and bulge from renal parenchyma, the normal tissue covers their contours with the formation of acute angles – the “claw” sign or the “beak” sign (↑).

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In cases when some masses or cysts grow and bulge from renal parenchyma, the normal tissue covers their contours with the formation of acute angles – the “claw” sign or the “beak” sign (↑). If the formation is nonorganic but adjoins the organ and probably compresses it, the organ contour will be wrapped inside. This sign does not indicate the benign origin of the lesion but shows the expansive variant of growth.