Lateral meniscus variant with posterior root entirely attaching to intercondylar/meniscofemoral ligaments (coronal reformat, black arrow) and no tibial root attachment. There are at least partial capsular attachments; however, the cartilage defect (white arrows) subjacent to the meniscus (sagittal reformat, black arrow) suggests hypermobility. The meniscus is c-shaped, rather than discoid. Still on the Wrisberg spectrum?
https://www.ajronline.org/doi/full/10.2214/AJR.04.1785
Intermediate-weighted 3D CAIPIRINHA SPACE TSE reformats at 0.6 mm isotropic spatial resolution at 1.5T
https://www.ajronline.org/doi/full/10.2214/AJR.04.1785
Intermediate-weighted 3D CAIPIRINHA SPACE TSE reformats at 0.6 mm isotropic spatial resolution at 1.5T
So the problem with the Wrisberg variant, I think, is that the "discoid" meniscus can either be slab type (complete) or incomplete type. Does the body of the meniscus measure even slightly large? I saw a very similar case the other day with a morphologically normal meniscus shape and no posterior root with a large Humphrey that I called variant. But didn't specify the discoid thing. That is what I would do with this if the meniscus size it totally normal. --kirk
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