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MRI imaging of displaced meniscal tears: Report of a case highlighting new potential pitfalls of the MRI signs.

Prasad A, Brar R, Rana S - Indian J Radiol Imaging (2014)

Bottom Line: Disproportional posterior horn and flipped meniscus signs represent asymmetrically thickened horns of the menisci due to overlying displaced meniscal fragments.We report a case wherein MRI of the knee showed tear and displacement of the medial patellofemoral ligament (MPFL) and vastus medialis complex, medial collateral ligament (MCL), and posterior cruciate ligament (PCL) mimicking these signs.To our knowledge, internally displaced MPFL and MCLs have not been described as mimics for displaced meniscal fragments.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Sector 62, Phase VIII, Fortis Hospital, Mohali, Punjab, India.

ABSTRACT
Magnetic resonance imaging (MRI) has been found to be an excellent imaging tool for meniscal injuries. Various MRI signs have been described to detect displaced meniscal injuries, specifically the bucket-handle tears. Although these signs are quite helpful in diagnosing meniscal tears, various pitfalls have also been reported for these signs. Double anterior cruciate ligament (ACL) sign refers to presence of a linear hypointense soft tissue anterior to the ACL, which represented the flipped bucket-handle tear of the meniscus. Disproportional posterior horn and flipped meniscus signs represent asymmetrically thickened horns of the menisci due to overlying displaced meniscal fragments. We report a case wherein MRI of the knee showed tear and displacement of the medial patellofemoral ligament (MPFL) and vastus medialis complex, medial collateral ligament (MCL), and posterior cruciate ligament (PCL) mimicking these signs. To our knowledge, internally displaced MPFL and MCLs have not been described as mimics for displaced meniscal fragments.

No MeSH data available.


Related in: MedlinePlus

Consecutive STIR coronal images showing complete tear of the femoral attachment of medial collateral ligament. The torn ligament is seen internally displaced and lying superior to the medial meniscus (arrows)
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Figure 6: Consecutive STIR coronal images showing complete tear of the femoral attachment of medial collateral ligament. The torn ligament is seen internally displaced and lying superior to the medial meniscus (arrows)

Mentions: On coronal STIR sequences, it was observed that the medial collateral ligament (MCL) was completely detached from its femoral attachment and displaced into the medial joint space. It was seen lying over the body of medial meniscus [Figures 6A–C]. Also, the proximal end of the torn PCL was seen lying over the posterior horn of medial meniscus (demonstrated through consecutive images in Figures 7A–C). These structures led to the appearance of “thick” posterior horn of medial meniscus.


MRI imaging of displaced meniscal tears: Report of a case highlighting new potential pitfalls of the MRI signs.

Prasad A, Brar R, Rana S - Indian J Radiol Imaging (2014)

Consecutive STIR coronal images showing complete tear of the femoral attachment of medial collateral ligament. The torn ligament is seen internally displaced and lying superior to the medial meniscus (arrows)
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126146&req=5

Figure 6: Consecutive STIR coronal images showing complete tear of the femoral attachment of medial collateral ligament. The torn ligament is seen internally displaced and lying superior to the medial meniscus (arrows)
Mentions: On coronal STIR sequences, it was observed that the medial collateral ligament (MCL) was completely detached from its femoral attachment and displaced into the medial joint space. It was seen lying over the body of medial meniscus [Figures 6A–C]. Also, the proximal end of the torn PCL was seen lying over the posterior horn of medial meniscus (demonstrated through consecutive images in Figures 7A–C). These structures led to the appearance of “thick” posterior horn of medial meniscus.

Bottom Line: Disproportional posterior horn and flipped meniscus signs represent asymmetrically thickened horns of the menisci due to overlying displaced meniscal fragments.We report a case wherein MRI of the knee showed tear and displacement of the medial patellofemoral ligament (MPFL) and vastus medialis complex, medial collateral ligament (MCL), and posterior cruciate ligament (PCL) mimicking these signs.To our knowledge, internally displaced MPFL and MCLs have not been described as mimics for displaced meniscal fragments.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Sector 62, Phase VIII, Fortis Hospital, Mohali, Punjab, India.

ABSTRACT
Magnetic resonance imaging (MRI) has been found to be an excellent imaging tool for meniscal injuries. Various MRI signs have been described to detect displaced meniscal injuries, specifically the bucket-handle tears. Although these signs are quite helpful in diagnosing meniscal tears, various pitfalls have also been reported for these signs. Double anterior cruciate ligament (ACL) sign refers to presence of a linear hypointense soft tissue anterior to the ACL, which represented the flipped bucket-handle tear of the meniscus. Disproportional posterior horn and flipped meniscus signs represent asymmetrically thickened horns of the menisci due to overlying displaced meniscal fragments. We report a case wherein MRI of the knee showed tear and displacement of the medial patellofemoral ligament (MPFL) and vastus medialis complex, medial collateral ligament (MCL), and posterior cruciate ligament (PCL) mimicking these signs. To our knowledge, internally displaced MPFL and MCLs have not been described as mimics for displaced meniscal fragments.

No MeSH data available.


Related in: MedlinePlus