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lüll MR imaging of bone marrow edema pattern: transient osteoporosis, transient bone marrow edema syndrome, or osteonecrosis Hayes CW; Conway WF; Daniel WWRadiographics 1993[Sep]; 13 (5): 1001-11; discussion 1012The 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.|*Magnetic Resonance Imaging[MESH]|Adult[MESH]|Bone Marrow Diseases/*diagnosis[MESH]|Diagnosis, Differential[MESH]|Edema/*diagnosis[MESH]|Female[MESH]|Femur/*pathology[MESH]|Hip[MESH]|Humans[MESH]|Male[MESH]|Middle Aged[MESH]|Osteonecrosis/*diagnosis[MESH]|Osteoporosis/*diagnosis[MESH]|Syndrome[MESH] |