Published in:
01-04-2020 | Magnetic Resonance Imaging | Classics in Abdominal Radiology
Notch sign in renal angiomyolipoma
Published in: Abdominal Radiology | Issue 4/2020
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The “notch sign” in renal angiomyolipoma (AML) is a triangular or rectangular notch-like defect (Fig. 1) in renal cortex from which the AML originates [1, 2]. It can be seen by computed tomography (CT) or magnetic resonance imaging (MRI) and refers to the sharp angles on either side of the AML, which the surrounding normal parenchyma of the renal cortex forms as the AML rises from it (Fig. 2a, b) and is also known as the “claw” sign [1‐3]. A feeding vessel often passes through the “notch” into the lesion (Fig. 2b) [3].
Fig. 1
Notch in the pumpkin
Fig. 2
a, b Axial (a) and sagittal oblique (b) CT scan show “notch”-like defect of renal parenchyma from which large AML originates (arrow) with a feeding vessel that passes into the lesion (open arrowhead) in a 67-year -old female in whom AML was incidentally discovered by CT 28 years ago
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