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15 Cards in this Set
- Front
- Back
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Should intravenous contrast be used in the routine diagnosis of marrow disorders?
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No may camouflage lesions by giving them signal characteristics similar to fatty marrow on T1W images, unless fat supression is used.
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Name the 3 components of bone marrow.
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Trabecular bone, red marrow, and yellow marrow
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2 functions of trabecular bone?
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Architectural support for red and yellow marrow
Mineral depot |
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Function of red marrow?
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Produces red cells, white cells, platelets
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Function of yellow marrow?
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? Surface/nutritional support for red marrow
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Which is the hematopoietically active fraction of marrow that produces blood cells?
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Red marrow
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Which is hematopoietically inactive and composed mainly of fat cells?
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Yellow marrow
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Of the 3 elements of bone marrow, which increases with age?
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yellow marrow fraction increases with age as trabecular bone resorbs from osteoporosis and fat fills in the spaces created
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T/F. Amount/distribution of red marrow varies from person to person, but not from side to side in the same person
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T
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What is a normal variation of red marrow seen in the subchondral region of proximal epiphyses of humeri and femora?
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Persistent curvilinear, subchondral red marrow
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What is the signal relationships of red marrow and muscle/intervertebral discs?
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Red marrow > muscle/intervertebral discs in signal intensity because of significant number of fat cells
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Five broad categories of marrow disease are:
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Marrow proliferative, marrow replacement, marrow depletion, vascular abnormalities, misc. marrow diseases
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If red marrow hyperplasia is massive, the signal intensity is abnormal and ____ or even ___ signal than muscle and disk on T1W images b/c of near complete replacement of all fatty elemetns on marrow.
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Isointense, lower
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What is the most common cause of marrow reconversion seen on MRI?
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obese women smokers
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Sickle cell anemia produces what MRI configuration?
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Osteonecrosis superimposed on diffuse marrow abnormalities
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