-The sagittal STIR (edema sensitive) MR image shows a thickened plantar fascia with edema. Contrast this with the thin fascia seen on the normal sagittal view.-The coronal PD (proton density) MR image also shows thickening and increased signal in the fascia.
Discussion
When patient's present to a doctor complaining of heel pain, plantar fasciitis is the most common cause. It is caused by repetitive microtrauma and is common in runners.
http://eradiology.bidmc.harvard.edu/Classics/item.aspx?section=Emergency+Radiology&labelpk=33f0adab-853f-4010-a0e2-0756b3f1eac5&pk=d9066408-e848-453f-a2dd-ecbe3b9786d7
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