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Sagittal MRI slices in T1-weighted (A) and proton density with fat saturation (B) sequences showing a cystic formation in the ACL with T1 hypointensity and PD fat sat hyperintensity. (C) Coronal proton density MRI slice with fat saturation showing the ACL cyst with a hyperintense signal. Note: a poorly defined hyperintense signal abnormality in the femoral shaft, suggesting a unicameral bone cyst.
