Saturday, February 11, 2012

MRI Staging of Avascular Necrosis

A staging system has been developed for avascular necrosis based on signal characteristics at the center of the lesion.

Class T1 T2 Comment
A High Intermediate Fat
B High High Blood
C Low High Fluid
D Low Low Fibrosis
Class A signal intensity is typically seen in early disease, while class D signal intensity is typically seen in late disease. However, more than one class of signal intensity can be found in a single lesion.


Mitchell DG, Rao VM, Dalinka MK, Spritzer CE, Alavi A, Steinberg ME, Fallon M, Kressel HY. Femoral head avascular necrosis: correlation of MR imaging, radiographic staging, radionuclide imaging, and clinical findings. Radiology. 1987 Mar;162(3):709-15.

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