Keyhole sign (intracapsular breast implant rupture)

Last revised by Dr Bruno Di Muzio on 01 Jul 2018

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 by MRI.

Differential diagnosis

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Cases and figures

  • Photograph: keyhole
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