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Bone marrow edema pattern around the knee on magnetic resonance imaging excluding acute traumatic lesions
Lynne S Steinbach1, Kyung Jin Suh
1Department of Radiology and Biomedical Imaging, University of California at San Francisco, San Francisco, CA 94143-0628, USA. lynne.steinbach@ucsf.edu
Abstract:
Magnetic resonance imaging (MRI) is very sensitive for the detection of marrow abnormalities. Bone marrow edema on MRI has been defined as an area of low signal intensity on T1-weighted images, associated with intermediate or high signal intensity findings on T2-weighted images. The bone marrow edema pattern is a nonspecific finding with multiple etiologies. The knee is a common place for bone marrow signal abnormalities to appear on MRI. Besides contusions and fractures from acute trauma, there are a variety of other causes of the bone marrow edema pattern. It is important for the interpreter of the study to be aware of the different etiologies responsible for producing these changes and to be able to narrow the differential diagnosis without mistaking such a pattern for acute trauma or infiltrative tumor. This article concentrates on those entities that produce a bone marrow edema pattern not related to acute trauma including red marrow proliferation, stress, osteochondral lesions, osteonecrosis, bone marrow edema syndrome, arthropathy, infection, Paget's disease, and marrow replacement disorders.
Insights
Magnetic resonance imaging (MRI) detects bone marrow abnormalities. This review details non-traumatic causes of bone marrow edema on MRI, aiding differential diagnosis beyond acute injury or tumors.
Area of Science:
- Radiology
- Orthopedic Imaging
- Medical Diagnostics
Background:
- Magnetic resonance imaging (MRI) is highly sensitive for detecting bone marrow abnormalities.
- Bone marrow edema on MRI is characterized by specific signal intensities on T1- and T2-weighted images.
- This edema pattern is nonspecific and can arise from various causes.
Purpose of the Study:
- To review and differentiate non-traumatic etiologies of bone marrow edema on MRI, particularly in the knee.
- To assist in narrowing the differential diagnosis for bone marrow edema.
- To distinguish bone marrow edema from acute trauma or infiltrative tumors.
Main Methods:
- Review of literature and imaging findings related to bone marrow edema.
- Categorization of non-traumatic causes of bone marrow edema.
- Emphasis on distinguishing features for differential diagnosis.
Main Results:
- Bone marrow edema on MRI has numerous causes beyond acute trauma.
- Key non-traumatic etiologies include red marrow proliferation, stress injuries, osteochondral lesions, osteonecrosis, bone marrow edema syndrome, arthropathy, infection, Paget's disease, and marrow replacement disorders.
- Recognizing these patterns is crucial for accurate diagnosis.
Conclusions:
- Bone marrow edema on MRI is a common finding with a broad differential diagnosis.
- Awareness of non-traumatic causes is essential for radiologists interpreting MRI studies.
- Accurate differentiation prevents misdiagnosis of acute trauma or malignancy.
