Anterior cruciate ligament mucoid degeneration and ganglion cyst

Discussion:

The etiology of ACL ganglion cysts is uncertain. Remote ligamentous trauma and mucoid degeneration play a role in the development of the cysts. MR imaging appearances are discrete fluid signal cystic structure within or on the surface of ACL. They have a tendency to extend into surrounding intra-articular or osseous structures.

Diffuse thickening with intra-ligamentous T2 hyperintensity and splaying of intact ACL fibers with a celery stalk appearance is consistent with mucoid degeneration of anterior cruciate ligament.

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