Keyhole sign (intracapsular breast implant rupture)

Last revised by Andrew Murphy on 23 Mar 2023

The keyhole or noose sign indicates an uncollapsed intracapsular breast implant rupture seen as the focal invagination of the implant shell caused by a small concealed leak of silicone outside shell where the two membranes do not contact each other. It is best appreciated on breast MRI.

Differential diagnosis

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Cases and figures

  • Figure 1: keyhole (photo)
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