Conclusions
The incidence of LRTI caused by TFBA is very high. However, the type and history of TFBA, cervicothoracic CT diagnosis, embedded location, clinical symptoms, weight, sex and age cannot predict its occurrence. There is no significant difference in the incidence of LRTI between organic and inorganic TFBA. Symptoms, cervicothoracic CT diagnosis and embedded location can only indicate the severity of the TFBA. The retention time of TFBA is the only indicator of the LRTI. Children with TFBA for a long retention time should be paid more attention in clinic.