Ankle and Foot 47 - Department of Radiology - University of ...

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47 Ankle and Foot 2263 47
Figure 47-71. Anderson stage IIA osteochondral
lesion of the talus—formation of a subchondral cyst.
A, Mortise radiograph; B, mortise coronal CT scan;
C, mortise coronal T1-weighted MRI; D, mortise
coronal T2-weighted fat-suppressed MRI. All images
show the subcortical cyst of the medial talar dome
with a thin sclerotic border (black arrows). The
overlying cortex is intact except for a small focal
irregularity (short white arrow). There is edema of the
underlying bone marrow (long white arrow). (Courtesy
of Richard Kijowski, MD.)
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Figure 47-72. Anderson stage III osteochondral
lesion of the talus—unattached, undisplaced
fragment. A, Mortise radiograph; B, mortise coronal CT
scan; C, mortise coronal T1-weighted MRI; D, mortise
coronal T2-weighted fat-suppressed MRI. All images
show the unattached nondisplaced fragment (short
arrows). Arrowheads point to the donor site. Long
arrow points to edema at the donor site. (Courtesy of
Richard Kijowski, MD.)
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Ch047-A05375.indd 2263
9/9/2008 5:35:02 PM