unusual presentation of metallic foreign body aspiration after penetrating neck trauma

a 25 year-old construction worker underwent neck laceration following penetrating neck trauma in a falling incident. the 3rd tracheal ring was injured which was initially repaired and the patient was discharged in good general condition. (figure 1 shows the patient’s neck view after discharge from hospital).two months later the patient was again admitted due to provocative coughing and a metal foreign body was detected in his right main bronchus. (figure 2 shows cxr of the patient and figure 3 demonstrates ct scan of the same patient). finally the patient underwent rigid bronchoscopy to remove the foreign body. (figure 4 shows the foreign body after rigid bronchoscopy).