The celery stalk sign refers to the appearance of hyperintense bands interposed between the fibers of a normally oriented anterior cruciate ligament (ACL). The celery stalk is best appreciated on sagittal, fluid-sensitive sequences. The hyperintense bands correspond to amorphous mucoid matrix collecting between intact, almost parallel anterior cruciate ligament fibers.
The celery stalk appearance corresponds to mucoid degeneration of the anterior cruciate ligament and should not be mistaken for a chronic or acute tear.
The celery stalk sign should not be confused with the celery stalk metaphysis.
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