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📌 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
- RadioGraphics 2018; 38:2069–2101
- Diagn Interv Imaging. 2016 Jul-Aug;97(7-8):789-807
- Clin Sports Med. 2014 Jul;33(3):413-36
- Skeletal Radiol. 2018 Aug;47(8):1069-1086
- Magn Reson Imaging Clin N Am 22 (2014) 601–620
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#MorelLavalleeLesion, #PrepatellarBursitis, #MusculoskeletalInjury, #MRIImaging, #SportsMedicine, #OrthopedicRadiology, #SoftTissueInjury, #KneeInjury, #DiagnosticImaging, #RadiologyEducation
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