![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZWXUbgCmv2RvrZAVROANxrelXsWITboDTg2J0og1DiYTIBoScgMElgZLCRTzfRgZpNlMa-j_QlQSCqPtesP5znt4oaKThJ9zWKB63Duk8tm_oXRr8p0U5Bxiin7_pIw596gwwF9WBxfA/s280/ClassD.JPG)
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.
References
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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