Haemorrhagic synovial cyst of the posterior cruciate ligament: a case report.

Cystic lesions arising in relation to the cruciate ligaments of the knee joint may become symptomatic and they can cause restriction of joint movement. We report here on a case of haemorrhagic synovial cyst arising from the posterior cruciate ligament with extension into the posterior compartment of the knee joint. We treated this lesion using the arthroscopic posterior-posterior triangulation technique. The histopathological findings of the synovial cyst were also verified. We would like to suggest that the posterior cruciate ligament synovial cyst should be considered in the differential diagnosis of cystic lesions that arise from the posterior compartment of the knee joint.