Introduction. Intra-articular ganglion cysts of the knee joint are rare and mostly incidental findings in magnetic resonance imaging\n(MRI) or arthroscopy. Posterior cruciate ligament (PCL) ganglion cyst in a child is an extremely rare finding, and to the best of our\nknowledge, only one case has been described in the literature. We report a case of a large intra-articular ganglion cyst of the knee\narising from the PCL in an autistic child. Case Presentation. An 8-year-old Caucasian boy affected by autism presented with\nnontraumatic knee pain. His parents, observing childâ??s gait, reported recurrent limp while walking, sometimes accompanied by\nknee locking. Clinical examination was hindered by the noncompliance of the patient and revealed painful limitation of\nterminal flexion and extension. MRI scans showed a large ganglion cyst located in the intercondylar notch. Arthroscopy\nconfirmed an intrasubstance PCL ganglion cyst, extending both anteriorly and posteriorly. Complete excision of the cyst was\nperformed, with full recovery of the child and no recurrence. Conclusion. In pediatric patients with pain or limited knee range of\nmotion, physicians should consider the possibility of a ganglion cyst arising from the PCL, despite its rarity. Arthroscopic\nexcision is a safe and effective procedure that guarantees a complete recovery of the patient with the lowest rate of recurrence.
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