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A venous aneurysm is characterized by a localized dilated lesion in most major veins. Popliteal venous aneurysms (PVAs) are rare; however, they are one of the causes of deep vein thrombosis (DVT) and pulmonary thromboembolism (PTE), which can be critical due to the high mortality risk. We present a 21-year-old woman without prior medical history, who arrived by ambulance after having a transient cardio-pulmonary arrest. Contrast computed tomography revealed a massive PTE and a right PVA with a thrombus. Laboratory data suggested that she had no thrombotic predisposition. Therefore, we diagnosed her condition as a massive PTE that derived from a thrombus, which arose from the right PVA. After successful intravenous thrombolysis of the PTE and DVT, surgical plication of the right PVA was performed to prevent the recurrence of PTE. She has had no recurrence of PTE or DVT two years after surgical treatment. This case suggests that surgical plication might be an effective way of preventing recurrence in patients with PVA. LEARNING OBJECTIVE: Popliteal venous aneurysm (PVA) occurrence is rare, but it can result in deep vein thrombosis (DVT) and pulmonary thromboembolism (PTE). To treat our patient who suffered transient cardiac-pulmonary arrest caused by a massive PTE, we first used a recombinant tissue plasminogen activator and anticoagulant therapy. After the condition was stabilized, surgical plication of the right PVA was performed to prevent DVT recurrence. The present case suggests that surgical plication might be beneficial.