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Prepatellar Morel-Lavallée Effusion Mimicking a Bursitis.

Hamza Retal¹, Nicolas Cavez², Erika De Smet¹

¹Radiology, Helora University Hospital, Nivelles, BEL.

|May 28, 2024

Summary

A prepatellar Morel-Lavallée lesion, a rare traumatic fluid collection, was successfully diagnosed using MRI after initial misdiagnosis as bursitis. Imaging is crucial for accurate diagnosis and guiding conservative treatment.

Keywords:

knee morel-lavallée effusion mri non-surgical orthopedics prepatellar bursitis

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Area of Science:

Orthopedics
Radiology
Traumatology

Background:

Morel-Lavallée lesions involve hemolymphatic fluid accumulation after subcutaneous tissue disruption.
These lesions typically occur in specific anatomical locations, with prepatellar presentation being uncommon.

Observation:

A 63-year-old woman presented with a prepatellar lesion initially diagnosed as bursitis.
Magnetic Resonance Imaging (MRI) was pivotal in correcting the diagnosis to a Morel-Lavallée lesion.
The lesion's anatomical extent and characteristics were clearly delineated by MRI.

Findings:

MRI confirmed the prepatellar Morel-Lavallée lesion, differentiating it from prepatellar bursitis and neoplastic conditions.
Conservative management with compression was effective for this specific case.
Surgical intervention is typically reserved for chronic or complicated Morel-Lavallée lesions.

Implications:

This case highlights the diagnostic utility of MRI for prepatellar Morel-Lavallée effusion (PMLE).
Accurate imaging is essential for appropriate management strategies in patients with this rare pathology.
Early and correct diagnosis via MRI can lead to timely and effective treatment, potentially avoiding unnecessary interventions.