Magnetic Resonance Imaging of Intra-Articular Lipomatous Lesions

Intra-articular lipomatous lesions encompass a spectrum of benign synovial processes, most notably lipoma arborescens and synovial lipoma, which may present with joint swelling, pain and mechanical symptoms. Magnetic resonance imaging (MRI) has become the gold standard for characterisation of these lesions. On MRI, lipoma arborescens manifests as a frond-like proliferation of synovium with fat-signal intensity on all pulse sequences, associated joint effusion and a pathognomonic suppression on fat-saturation sequences. Synovial lipomas appear as well-circumscribed, homogeneous masses of fat signal, often without the villous architecture seen in lipoma arborescens. Advanced techniques—including high-resolution coils, multi-planar imaging and quantitative fat mapping—have improved lesion detection and differentiation from other joint pathologies such as pigmented villonodular synovitis or synovial chondromatosis. Early and accurate MRI diagnosis guides management decisions, particularly timely arthroscopic synovectomy, which can relieve symptoms and may prevent secondary osteoarthritis. Recognition of characteristic imaging appearances across different joints, including knee, elbow and wrist, underlines the global relevance of MRI in guiding safe, minimally invasive treatment strategies.

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Magnetic Resonance Imaging of Intra-Articular Lipomatous Lesions publication trend

The graph below shows the total number of articles in magnetic resonance imaging of intra-articular lipomatous lesions across all publications each year (not limited to Nature Index journals).

Technical terms

Magnetic Resonance Imaging: Non-invasive imaging technique that uses magnetic fields and radiofrequency pulses to generate high-contrast images of soft tissues, particularly useful for characterising intra-articular lesions based on signal properties.

Lipoma arborescens: Benign synovial lesion characterised by villous proliferation of synovial membrane with subsynovial adipose infiltration, producing a frond-like appearance on MRI.

Synovial lipoma: A focal, well-defined intra-articular fat tumour arising from the synovial lining, distinct from diffuse villous proliferation seen in lipoma arborescens.

Synovectomy: Surgical removal of affected synovial tissue, often performed arthroscopically, to alleviate symptoms and prevent joint degeneration.

Fat-suppression sequence: MRI pulse sequence designed to nullify the signal from adipose tissue, enhancing contrast between fat-containing lesions and surrounding structures.

References

1. Primary lipoma arborescens of the knee may involve the development of early osteoarthritis if prompt synovectomy is not performed. Journal of Orthopaedics and Traumatology (2014).
2. Surgical management of upper limb lipoma arborescens: a systematic review. Journal of Orthopaedic Surgery and Research (2022).
3. Lipoma arborescens in a 22-year-old male: A case report. Medicine (2024).
4. A Rare Presentation of a True Intra-articular Lipoma: A Case Report and Review of Imaging Findings. Cureus (2022).