Symptomatic popliteal venous aneurysm causing a footdrop.

Symptomatic aneurysms of the popliteal vein are uncommon, with the majority resulting in thromboembolic complications. Neurologic symptoms are extremely rare. We present a case of a 53-year-old man with a footdrop resulting from a saccular popliteal venous aneurysm. Compression of the peroneal nerve caused the neurologic deficit. After aneurysmectomy and lateral venorrhaphy, the patient regained full strength of his lower leg muscles. Neurologic complications caused by a popliteal venous aneurysm should be considered in patients with a swelling in the popliteal fossa and a neurologic deficit of the lower extremity.