A 29-year-old man presented a 2-week history of right popliteal fossa and leg swelling following an arthroscopic meniscectomy. Roentgenographic evaluation showed an arterial and venous aneurysm at the popliteal level, with an associated arteriovenous fistula. Popliteal aneurysm in young men is very rare and generally related to open surgical techniques; incidence with arthroscopic techniques is extremely infrequent.