MR imaging of bone marrow edema pattern: transient osteoporosis, transient bone marrow edema syndrome, or
C W Hayes1, W F Conway, W W Daniel
1Department of Radiology, Medical College of Virginia, Virginia Commonwealth University, Main Hospital, Richmond 23298.
Abstract:
The bone marrow edema (BME) pattern of signal intensity changes on magnetic resonance (MR) images (decreased on T1-weighted and increased on T2-weighted) is a nonspecific finding encountered with several entities, including transient osteoporosis of the hip, transient BME syndrome, osteonecrosis, trauma, infection, and infiltrative neoplasm. Transient osteoporosis, an unusual but distinct syndrome characterized by self-limited pain and radiographically evident osteopenia, can be distinguished from other causes of the BME pattern, particularly osteonecrosis, on the basis of clinical findings and the development of radiographically evident focal osteopenia within 8 weeks after the onset of pain. This is an important distinction, since all patients with transient osteoporosis recover completely, without intervention. The term transient BME syndrome can be used to describe any patient in whom a reversible BME pattern is seen on MR images. Although the transient BME syndrome is also self-limited and quite likely related to transient osteoporosis, the authors believe that to avoid confusion, this nonspecific term should be reserved only for patients who do not develop radiographically evident osteopenia.
Insights
Transient osteoporosis is a self-limited hip condition causing bone marrow edema (BME) on MRI. It is distinct from other BME causes, with patients fully recovering without intervention.
Area of Science:
- Radiology
- Orthopedics
- Bone Diseases
Background:
- Bone marrow edema (BME) on MRI is a nonspecific finding.
- BME can indicate various conditions like transient osteoporosis, osteonecrosis, trauma, infection, or neoplasm.
- Distinguishing transient osteoporosis from other BME causes is crucial for appropriate patient management.
Purpose of the Study:
- To differentiate transient osteoporosis from other causes of BME on MRI.
- To clarify the diagnostic criteria for transient osteoporosis and transient BME syndrome.
- To emphasize the favorable prognosis of transient osteoporosis.
Main Methods:
- Review of MRI findings in patients presenting with BME.
- Correlation of imaging findings with clinical presentation and radiographic changes.
- Analysis of the temporal evolution of BME and development of osteopenia.
Main Results:
- Transient osteoporosis is characterized by self-limited pain and develops focal osteopenia within 8 weeks.
- Distinguishing transient osteoporosis from osteonecrosis relies on clinical and radiographic follow-up.
- Transient BME syndrome describes reversible BME on MRI but should be reserved for cases without evident osteopenia.
Conclusions:
- Transient osteoporosis is a distinct, self-limiting condition with complete recovery.
- Early differentiation of transient osteoporosis from other BME causes is vital.
- The term transient BME syndrome should be used cautiously to avoid diagnostic confusion.
