Infective popliteal artery aneurysm by Streptococcus equi: An unusual pathogen.

We report the case of a 63-year-old man who presented with a 2-week complaint of lower extremity pain, swelling, and low-grade fever after an episode of septic arthritis in the ipsilateral knee. The investigation showed a rapidly expanding popliteal artery aneurysm (PAA). The rare clinical entity of an infective PAA was suspected and was confirmed by the cultures obtained at the right femoropopliteal bypass with an autologous vein graft and subtotal resection of the aneurysm sac. Streptococcus equi was identified as the primary pathogen, which, to the best of our knowledge, has not been previously described for an infective PAA.