Bone marrow changes on STIR MR images of asymptomatic feet and ankles |
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Authors: | Veronika Zubler Bernard Mengiardi Christian W A Pfirrmann Sylvain R Duc Marius R Schmid Juerg Hodler Marco Zanetti |
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Institution: | (1) Department of Radiology, University Hospital, Balgrist, Forchstrasse 340, 8008 Zurich, Switzerland |
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Abstract: | The purpose of this study was to evaluate the prevalence, pattern and size of bone marrow changes on short-tau inversion recovery
(STIR) magnetic resonance (MR) images of asymptomatic feet and ankles. In 78 asymptomatic volunteers (41 women, 37 men; median
age 47 years; range 23–83 years) sagittal STIR MR images of hindfoot and midfoot were reviewed for various patterns of high
signal changes in bone marrow. The size of these bone marrow changes was measured, and signal intensity was rated semi-quantitatively
using a scale from 0 (=normal) to 10 (=fluid-like). Fifty percent (39/78) of all volunteers had at least one bone marrow change.
Thirty-six percent (28/78) of all volunteers had edema-like changes, 26% (20/78) had necrosis-like changes, and 5% (4/78)
had cyst-like changes. The long diameters of all changes varied between 4 mm and 16 mm (median 7.5 mm). The median signal
intensity for all changes was 5.0 (range 1–10). Bone marrow changes on STIR MR images are commonly detected in asymptomatic
feet and ankles. However, such changes tend to be small (<1 cm) or subtle. |
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Keywords: | Foot MR imaging Pitfalls Bone marrow Normal variants |
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