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*Air-fluid levels (radiology). | *Air-fluid levels (radiology). | ||
*Usually metaphysis of long bones, but uncommonly the femur. | *Usually metaphysis of long bones, but uncommonly the femur. | ||
*May have an "aggressive" appearance. | *May have an "aggressive" appearance, i.e. erode bone. | ||
===Microscopic=== | ===Microscopic=== |
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