(Fig 4-D.04) Morel-Lavallée Lesion

https://youtu.be/J1ynXFC2_70

https://youtu.be/YiEAI7pISIU

 

 

==============================================

🎥 Check Out All Videos at Once! 📺

👉 Visit Visualizing MSK Blog to explore a wide range of videos! 🩻

https://visualizingmsk.blogspot.com/?view=magazine

📚 You can also find them on MSK MRI Blog and Naver Blog! 📖

https://mskmri.tistory.com/

https://blog.naver.com/mskmri

https://www.instagram.com/msk_mri/

Click now to stay updated with the latest content! 🔍✨

==============================================

📌 Morel-Lavallée Lesion

✅ Definition and Clinical Presentation

• A Morel-Lavallée lesion is a closed degloving injury that occurs when there is a shearing force between the subdermal tissues and the underlying fascia. 
• This creates a potential space that fills with fluid, blood, lymph, and/or necrotic fat. It commonly occurs in the prepatellar region due to falls onto the knee or direct blows during sports activities .
• Patients with a Morel-Lavallée lesion often present with a soft, painless mass. The lesion can cause palpable fluctuance, limited knee flexion, and decreased sensation.

✅ Imaging Characteristics

• Acute to Subacute Phase: T2 hyperintense fluid with blood clots and debris within an ovoid cavity. The effusion may appear increased or intermediate in signal intensity on T1-weighted images.
• Chronic Phase: Lesions may have a well-demarcated fibrous capsule and can show complex heterogeneous collections containing degraded blood products and internal fatty debris with prominent mural nodularity.

 

✅ Differential Diagnosis

Morel-Lavallée Lesion vs. Prepatellar Bursitis:

• Morel-Lavallée lesions are eccentrically positioned relative to the patella and extend medially or laterally to the level of the femoral epicondyles. 
• They contain internal fat globules and persist at follow-up examinations.
• Prepatellar bursitis, specifically chronic hemorrhagic prepatellar bursitis, may present with overlapping imaging features but does not extend beyond the prepatellar bursa.

 

References

1. RadioGraphics 2018; 38:2069–2101
2. Diagn Interv Imaging. 2016 Jul-Aug;97(7-8):789-807
3. Clin Sports Med. 2014 Jul;33(3):413-36
4. Skeletal Radiol. 2018 Aug;47(8):1069-1086
5. Magn Reson Imaging Clin N Am 22 (2014) 601–620

 

"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"

© 2022 MSK MRI Jee Eun Lee All Rights Reserved.

No unauthorized reproduction, redistribution, or use for AI training.

#MorelLavalleeLesion, #PrepatellarBursitis, #MusculoskeletalInjury, #MRIImaging, #SportsMedicine, #OrthopedicRadiology, #SoftTissueInjury, #KneeInjury, #DiagnosticImaging, #RadiologyEducation