Keyhole sign (intracapsular breast implant rupture)

Last revised by Dr Daniel J Bell on 02 Jan 2022

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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