PMC6425303_01
Preoperative magnetic resonance images of the left knee revealed large round-shaped cystic mass encasing the PCL with homogeneous low-signal intensity on sagittal proton density-weighted image (PDWI) (a) and on turbo spin echo (TSE) imaging (b). The lesion appears highly hyperintense on sagittal and coronal turbo inversion recovery magnitude (TIRM) images (c, d).
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fig1
The round-shaped cystic mass encasing the PCL depicted homogeneous low-signal intensity, slightly hyperintense relative to the muscles, on proton density-weighted image (PDWI) and on turbo spin echo (TSE) imaging and high-signal intensity on turbo inversion recovery magnitude (TIRM) images (Figure 1).
A round-shaped ganglion cyst (GC) as seen on arthroscopy from the anterolateral portal, before (a) and after (b) excision. The GC was located between the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL), tightly attached to the PCL.
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fig2
Arthroscopic examination, performed through standard anterolateral and anteromedial portals, revealed a large white encapsulated ganglion cyst, with blood vessels on the surface, filling the femoral notch (Figure 2).
Hematoxylin-eosin staining shows that the cyst wall is lined by synovial cells and is composed of dense fibroconnective tissue, widespread thick bundles of collagen (*), and capillary proliferation (red arrow). (a) x10 and (b) x40.
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fig3
Histologic examination revealed the proliferation of synovial cells lined with dense fibroconnective tissue, widespread thick bundles of collagen and capillary proliferation, confirming the diagnosis of posterior cruciate ligament ganglion cyst (Figure 3).