Gossypiboma, an infrequent surgical complication, is a mass lesion due to a retained surgical sponge surrounded by foreign-body reaction. A 27-year-old lady presented with palpable abdominal mass five years after cesarean section. Retained foreign body was diagnosed radiologically and confirmed with operation. Retained foreign body should be in the differential diagnosis of any postoperative patient who presents with pain, infection, or palpable mass.