An 84-year old woman developed 2 large seromal cysts at the medial side of her right thigh, 4 months after total knee arthroplasty (TKA). The cysts were located at the place where the tourniquet, during surgery, had been applied. The diagnosis was confirmed with echography and magnetic resonance imaging. Both cysts were resected, and the patient recovered completely, after one relapse in which a lymphatic vessel was sutured.
Development of seromal cyst after tourniquet use during TKA is a rare but serious complication.