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Absent bowtie sign

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The absent bowtie sign is a radiologic sign indicative of a meniscal tear in the knee joint. On sagittal magnetic resonance (MR) images, the body of the meniscus normally looks like a bow tie, with two distinct segments. The absent bowtie sign is present when there is a lack of two segments seen on consecutive sagittal MR images. This sign can be used to diagnose "bucket-handle" tears of the mensici, which are longitudinal tears with displaced fragment(s). The "handle" is created when the inner meniscal fragment is displaced into the intercondylar notch.

References

  1. Lieberman, Kristin A. (2000). "The Absent Bow Tie Sign". Radiology. 215 (1): 263–265. doi:10.1148/radiology.215.1.r00ap25263. ISSN 0033-8419.
  2. Helms, C A; Laorr, A; Cannon, W D (1998). "The absent bow tie sign in bucket-handle tears of the menisci in the knee". American Journal of Roentgenology. 170 (1): 57–61. doi:10.2214/ajr.170.1.9423600. ISSN 0361-803X.
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