(Fig 1-B.22) Absent Bow Tie and Disproportional Posterior Horn Signs

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Absent bow tie sign

• The absent bow tie sign, where the innermost bow tie is not present, can also be seen in a small or pediatric patient and with a radial tear of the body, macerated meniscus, or prior partial meniscectomy

 

Disproportionally small posterior horn

• The disproportional posterior horn sign implies the presence of a larger meniscal posterior horn in the central section than that in the peripheral section of the sagittal MR image and this is due to a meniscal fragment displaced posterior and centrally

 

Flipped meniscus sign

• When viewed in a sagittal section two apparent anterior horns are seen: 
• the anterior triangle representing the normal anterior horn and the posterior triangle the anteriorly displaced meniscal fragment.
• It is a variant of bucket handle tear in which the meniscal fragment is displaced from the posterior horn into the ipsilateral anterior compartment, giving a 'Pseudo-hypertrophied' anterior horn

 

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