foreign body aspiration in adults (two unusual foreign bodies; knife and tube tracheostomy)

introduction:foreign body aspiration is usually a serious condition that is most common among the pediatric population, and rare in adults. in adults, aspiration may be tolerated for a long time.case reports:our first case is a 38-year-old man who presented with a 2-day history of swallowing a foreign body. he was completely asymptomatic. chest x-ray revealed the presence of 5-cm foreign object in the right main bronchus. rigid bronchoscopy was performed and a knife was removed from the right main bronchus. second, a 57-year old man with a known case of laryngeal cancer from 15 years previously was admitted for respiratory distress. he had previously undergone a permanent tracheostomy and had received radiotherapy for his cancer. at the first visit, the patient had prominent distress and was transferred to the operating room as an emergency. a tube was seen on chest x-ray. on bronchoscopy, we found the tracheostomy situated in the carina. the cleaved tracheostomy was removed using the grasper, by grasping the cuff line.conclusion:we conclude that foreign body aspiration might be completely asymptomatic, especially in an adult. a good history and imaging findings can help us to diagnose and treat the condition carefully.