A 23-year-old male was refered to our department because of persistence for one month of pain and claudication of the right lower leg. A palpable mass over the popliteal foossa was noted. A radiographic evaluation, including plain X-ray films, a computer tomography (CT), magnetic resonance imaging (MRI), and bone scan revealed an exostosis protruding from the posterior tibial plateau inferior to the insertion site of the posterior cruciate ligament(PCL) and pressing against the neurovascular bundle in the popliteal fossa. It is uncommon to find posterior neurovascular compromise caused by a solitary osteochondroma. Surgical resection can prevent later complications such as phlebitis, vascular occlusion or pulmonary embolism. Following surgery, no neurovascular complication was noted and the patient regained a normal range of motion on the right knee one month later.