Bow-tie sign

(Adapted from Vahlensieck et al. & Helms et al.)

Central sagittal slice sequences of the normal meniscus demonstrate triangles of signal void (above, A).  On peripheral sagittal sequences, the normal meniscus has a “bow tie” appearance (above, B) for 2-3 consecutive slices.   With a displaced tear, normal bow-tie configuration is absent on consecutive sagittal sequences (below, B).

These findings are best visualized on sagittal MR sequences.

Lat Menisc

Tibia

Lat Femoral Condyle

Normal bow-tie configuration of the lateral meniscus posterior horn is demonstrated (above).