<prompt> Answer this question truthfullyWhat is the reason for children with cyanotic congenital heart disease such as tetralogy of Fallot being at an increased risk for brain abscess?  <response>: <reason> Children with cyanotic congenital heart disease are at an increased risk for brain abscess because right-to-left shunting of venous blood allows bacteria to bypass the pulmonary circulation and spread hematogenously. 