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Posterior cruciate ligament (PCL): partial tear and mucoid degeneration. A) Sagittal proton density-weighted (PDW) fat-saturated (FS) magnetic resonance (MR) image in an 84-year-old male with increased signal in midportion of PCL representing prior partial PCL tear (arrow). B) Sagittal PDW FS magnetic resonance image in a different patient shows “tram track” appearance (arrow) of PCL consistent with mucoid degeneration
