Absent bowtie sign
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.[1] 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.[2]
References
[edit]- ^ Lieberman, Kristin A. (2000). "The Absent Bow Tie Sign". Radiology. 215 (1): 263–265. doi:10.1148/radiology.215.1.r00ap25263. ISSN 0033-8419.
- ^ 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.