الملخص
A gossypiboma is an inflammatory pseudotumor that forms when a surgical sponge or gauze is accidentally left behind during surgery, triggering a foreign body reaction. This condition can lead to complications in nearby tissues. Gossypibomas are most commonly found in the abdomen, pelvis, or thorax. However, they are extremely rare in the extremities, making them difficult to diagnose. As a result, they can be mistaken for soft tissue tumors in these areas. This paper presents the case of a 12-year-old boy with a solid mass in his right anterior thigh, later identified as a gossypiboma with characteristic magnetic resonance imaging findings. When evaluating patients with a soft tissue mass and a history of surgery, gossypiboma should be included in the differential diagnosis.