Patient, male, 36 years old. He was admitted to the hospital with “foreign body in the septal sinus (right) and ocular contusion (right)” due to post-traumatic swelling and pain in the right eye with right nasal bleeding for 16 hours. He was previously in good health. One day before admission, at about 4:00 p.m., he was engaged in machine tool planing work when he accidentally injured his right eye with a splash of iron. At that time, the right eye and nasal cavity were bleeding more than once, and the pain was obvious, accompanied by blurred vision in the right eye. He immediately went to the county people’s hospital for medical treatment, and the frontal and lateral cranial radiographs showed that the right septal sinus was a foreign body; he was transferred to our hospital for surgery. On admission, the general condition was good; the right upper eyelid was swollen and bruised, and there was a 4 mm long wound on the skin of the right medial canthus, which had crusted on the surface. CT of sinus and orbit (64-row reconstruction) showed soft tissue contusions around the right eye and a metallic foreign body with blood accumulation in the right septal sinus. On the third day after admission, he underwent general anesthesia endoscopic septal correction + right septal sinus open foreign body removal. A 13×5×3mm irregular Mitsubishi column-shaped metal foreign body was found in the anterior septum, which compressed the substrate of the middle turbinate posteriorly and had not yet protruded into the posterior septum. The patient was discharged on the sixth postoperative day, and the blurred vision disappeared, the visual acuity returned to the pre-injury normal level, there was no restriction of movement of both eyes, and no scar remained on the face. Diagnosis: foreign body in the septal sinus (right) and ocular contusion (right). At 40 days postoperative follow-up, the patient had a clear nasal ventilation, the right septal sinus was completely epithelialized by nasal endoscopy, and the sinus opening was well drained; there were no sequelae left. With the progress of society, the scope of human activities is expanding, and various accidental injuries occur from time to time, and foreign bodies in the nasal cavity and sinuses are not uncommon in clinical practice. In the past, for foreign bodies deep in the sinuses, open surgery was required to remove the foreign bodies, which was more traumatic and easily injured important adjacent structures, and left permanent scars on the face. In recent years, with the application and promotion of nasal endoscopy technology, the advantages of minimally invasive, visualization and magnification are obvious. In the patient with a post-traumatic septal sinus metallic foreign body presented in this paper, it was successfully removed under nasal endoscopy with little bleeding, clear visualization, avoiding injury to adjacent blood vessels and important adjoining structures, without any complications, and with good postoperative recovery and no sequelae left behind. Therefore, nasal sinus foreign bodies can be removed by different surgical methods depending on the site of retention, and for foreign bodies deep in each sinus cavity, nasal endoscopic surgical removal has obvious advantages and is worth promoting. Figure 1: Physical picture of sieve sinus metal foreign body (irregular Mitsubishi columnar shape) Figure 2: Horizontal CT film of sieve sinus metal foreign body (right) Figure 3: Sagittal CT film of sieve sinus metal foreign body