Table 1. Bergin’s MRI Criteria for Anterior Cruciate Ligament Ganglion Cyst and Mucoid Cyst Degeneration.

ACL: anterior cruciate ligament, MRI: magnetic resonance imaging

	Ganglion cyst	Common criteria	Mucoid degeneration
1	Fluid signal in the substance of the ligament with at least two of the three following criteria	ACL fibers intact and uninterrupted from tibial to femoral insertion	Ligament fibers poorly seen on T1-weighted images
2	Mass effect on anterior cruciate better ligament fibers	Possibly associated with joint effusion or bony cysts	Ligament bundles and fibers seen on T2-weighted images
3	Ligament signal stronger than joint fluid
4	Lobulated with definite margins