Despite the rare cases of detection of foreign bodies in the abdominal cavity, this problem is urgent. According to the literature, foreign bodies are detected 1 in 1000—1500 surgical interventions. Gossypibomas (gossypium — cotton) are found in 67% of cases. Therefore, it is important for surgeons working with previously operated patients to pay attention to the findings during physical and instrumental examinations. We present a clinical case of prolonged presence of a foreign body in the area of a trocar scar in the umbilical zone (12 years). The patient was observed at the New Me clinic «Clinic of Aesthetic Medicine and Gerudotherapy» from December 2023 to January 2024, where post-bariatric abdominoplasty was performed in December 2023. In this case, the patient’s carriage of a foreign body, judging by the anamnesis, was not accompanied by clinical manifestations. It was revealed in preparation for ultrasound surgery as a random find. Which was confirmed during the operation. And in the postoperative period, the bed of gossypiboma was complicated by a fistula passage from subcutaneous fat to the anterior abdominal wall. Which led to a longer postoperative recovery. But sometimes clinically foreign bodies can initiate pain, bleeding, perforation of hollow organs, so it is important to be able to compare medical history, clinic data and begin the necessary treatment proactively. The presented clinical case of prolonged presence of gossypiboma in the patient’s body emphasizes the importance of using a checklist of surgical safety, postoperative patient monitoring and alertness of surgeons leading patients with repeated operations to exclude gossypibiomas in non-specific clinical and diagnostic manifestations at the site of previous intervention.